diff --git a/.github/workflows/isort.yml b/.github/workflows/isort.yml
new file mode 100644
index 0000000000..22c73d4ece
--- /dev/null
+++ b/.github/workflows/isort.yml
@@ -0,0 +1,15 @@
+name: Linter
+on: pull_request
+jobs:
+  isort:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          python-version: 3.8
+
+      - name: Run checks
+        run: |
+          pip install --user -r <(grep "^isort" ./requirements.txt)
+          isort --check --diff .
diff --git a/.isort.cfg b/.isort.cfg
new file mode 100644
index 0000000000..ef57375c8b
--- /dev/null
+++ b/.isort.cfg
@@ -0,0 +1,6 @@
+[settings]
+forced_separate = tests
+from_first = True
+include_trailing_comma = True
+line_length = 80
+multi_line_output = 5
diff --git a/.pylintrc b/.pylintrc
index 2c9edce81b..92f0a4f3a9 100644
--- a/.pylintrc
+++ b/.pylintrc
@@ -61,7 +61,7 @@ enable= E0001,E0100,E0101,E0102,E0103,E0104,E0105,E0106,E0107,E0110,
         E0702,E0703,E0704,E0710,E0711,E0712,E1003,E1102,E1111,E0112,
         E1120,E1121,E1123,E1124,E1125,E1126,E1127,E1132,E1200,E1201,
         E1205,E1206,E1300,E1301,E1302,E1303,E1304,E1305,E1306,
-        C0123,C0200,C0303,C0411,C1001,
+        C0123,C0200,C0303,C1001,
         W0101,W0102,W0104,W0105,W0106,W0107,W0108,W0109,W0110,W0120,
         W0122,W0124,W0150,W0199,W0221,W0222,W0233,W0404,W0410,W0601,
         W0602,W0604,W0611,W0612,W0622,W0623,W0702,W0705,W0711,W1300,
diff --git a/datum.py b/datum.py
index 12c150bd16..d19ffe646a 100755
--- a/datum.py
+++ b/datum.py
@@ -3,6 +3,5 @@
 
 from datumaro.cli.__main__ import main
 
-
 if __name__ == '__main__':
     sys.exit(main())
diff --git a/datumaro/__main__.py b/datumaro/__main__.py
index be1cb09298..062f6f0cd4 100644
--- a/datumaro/__main__.py
+++ b/datumaro/__main__.py
@@ -7,6 +7,5 @@
 
 from datumaro.cli.__main__ import main
 
-
 if __name__ == '__main__':
     sys.exit(main())
diff --git a/datumaro/cli/__main__.py b/datumaro/cli/__main__.py
index 528c6d019e..b2113b6f1f 100644
--- a/datumaro/cli/__main__.py
+++ b/datumaro/cli/__main__.py
@@ -8,10 +8,9 @@
 import os.path as osp
 import sys
 
-from . import contexts, commands
-from .util import CliException, add_subparser
 from ..version import VERSION
-
+from . import commands, contexts
+from .util import CliException, add_subparser
 
 _log_levels = {
     'debug': log.DEBUG,
diff --git a/datumaro/cli/commands/__init__.py b/datumaro/cli/commands/__init__.py
index 9324f12252..febb60775a 100644
--- a/datumaro/cli/commands/__init__.py
+++ b/datumaro/cli/commands/__init__.py
@@ -5,9 +5,6 @@
 # pylint: disable=redefined-builtin
 
 from . import (
-    create, add, remove, import_,
-    explain,
-    export, merge, convert, transform, filter,
-    diff, ediff, stats,
-    info, validate
+    add, convert, create, diff, ediff, explain, export, filter, import_, info,
+    merge, remove, stats, transform, validate,
 )
diff --git a/datumaro/cli/commands/convert.py b/datumaro/cli/commands/convert.py
index 6d657d9b0b..bef04ef912 100644
--- a/datumaro/cli/commands/convert.py
+++ b/datumaro/cli/commands/convert.py
@@ -7,8 +7,8 @@
 import os
 import os.path as osp
 
-from datumaro.components.project import Environment
 from datumaro.components.dataset import Dataset
+from datumaro.components.project import Environment
 
 from ..contexts.project import FilterModes
 from ..util import CliException, MultilineFormatter, make_file_name
diff --git a/datumaro/cli/commands/explain.py b/datumaro/cli/commands/explain.py
index dc4256194c..fe5c1dd39f 100644
--- a/datumaro/cli/commands/explain.py
+++ b/datumaro/cli/commands/explain.py
@@ -8,9 +8,12 @@
 import os.path as osp
 
 from datumaro.components.project import Project
-from datumaro.util.command_targets import (TargetKinds, target_selector,
-    ProjectTarget, SourceTarget, ImageTarget, is_project_path)
+from datumaro.util.command_targets import (
+    ImageTarget, ProjectTarget, SourceTarget, TargetKinds, is_project_path,
+    target_selector,
+)
 from datumaro.util.image import load_image, save_image
+
 from ..util import MultilineFormatter
 from ..util.project import load_project
 
@@ -108,8 +111,8 @@ def explain_command(args):
             args.project_dir = osp.dirname(osp.abspath(args.target[1]))
 
 
-    import cv2
     from matplotlib import cm
+    import cv2
 
     project = load_project(args.project_dir)
 
diff --git a/datumaro/cli/commands/merge.py b/datumaro/cli/commands/merge.py
index 8a265035c3..fee44ff1a5 100644
--- a/datumaro/cli/commands/merge.py
+++ b/datumaro/cli/commands/merge.py
@@ -2,17 +2,17 @@
 #
 # SPDX-License-Identifier: MIT
 
+from collections import OrderedDict
 import argparse
 import json
 import logging as log
 import os.path as osp
-from collections import OrderedDict
 
-from datumaro.components.project import Project
+from datumaro.components.errors import MergeError, QualityError
 from datumaro.components.operations import IntersectMerge
-from datumaro.components.errors import QualityError, MergeError
+from datumaro.components.project import Project
 
-from ..util import at_least, MultilineFormatter, CliException
+from ..util import CliException, MultilineFormatter, at_least
 from ..util.project import generate_next_file_name, load_project
 
 
diff --git a/datumaro/cli/contexts/__init__.py b/datumaro/cli/contexts/__init__.py
index b903435527..1598ff704c 100644
--- a/datumaro/cli/contexts/__init__.py
+++ b/datumaro/cli/contexts/__init__.py
@@ -3,4 +3,4 @@
 #
 # SPDX-License-Identifier: MIT
 
-from . import project, source, model
\ No newline at end of file
+from . import model, project, source
diff --git a/datumaro/cli/contexts/model.py b/datumaro/cli/contexts/model.py
index dfb2dc5ba9..20f1bffee3 100644
--- a/datumaro/cli/contexts/model.py
+++ b/datumaro/cli/contexts/model.py
@@ -12,8 +12,9 @@
 from datumaro.util import error_rollback
 
 from ..util import CliException, MultilineFormatter, add_subparser
-from ..util.project import load_project, \
-    generate_next_name, generate_next_file_name
+from ..util.project import (
+    generate_next_file_name, generate_next_name, load_project,
+)
 
 
 def build_add_parser(parser_ctor=argparse.ArgumentParser):
diff --git a/datumaro/cli/contexts/project/__init__.py b/datumaro/cli/contexts/project/__init__.py
index 64fd31e1aa..0e03593c2d 100644
--- a/datumaro/cli/contexts/project/__init__.py
+++ b/datumaro/cli/contexts/project/__init__.py
@@ -2,27 +2,30 @@
 #
 # SPDX-License-Identifier: MIT
 
+from enum import Enum
 import argparse
 import json
 import logging as log
 import os
 import os.path as osp
 import shutil
-from enum import Enum
+
 import numpy as np
 
 from datumaro.components.dataset_filter import DatasetItemEncoder
 from datumaro.components.extractor import AnnotationType
-from datumaro.components.operations import (DistanceComparator,
-    ExactComparator, compute_ann_statistics, compute_image_statistics)
-from datumaro.components.project import \
-    PROJECT_DEFAULT_CONFIG as DEFAULT_CONFIG
+from datumaro.components.operations import (
+    DistanceComparator, ExactComparator, compute_ann_statistics,
+    compute_image_statistics,
+)
+from datumaro.components.project import PROJECT_DEFAULT_CONFIG as DEFAULT_CONFIG
 from datumaro.components.project import Environment, Project
 from datumaro.components.validator import TaskType
 from datumaro.util import error_rollback
 
-from ...util import (CliException, MultilineFormatter, add_subparser,
-    make_file_name)
+from ...util import (
+    CliException, MultilineFormatter, add_subparser, make_file_name,
+)
 from ...util.project import generate_next_file_name, load_project
 from .diff import DatasetDiffVisualizer
 
diff --git a/datumaro/cli/contexts/project/diff.py b/datumaro/cli/contexts/project/diff.py
index 1df1b8ab65..cb919e156f 100644
--- a/datumaro/cli/contexts/project/diff.py
+++ b/datumaro/cli/contexts/project/diff.py
@@ -4,12 +4,13 @@
 # SPDX-License-Identifier: MIT
 
 from collections import Counter
-from itertools import zip_longest
 from enum import Enum, auto
+from itertools import zip_longest
 import logging as log
 import os
 import os.path as osp
 import warnings
+
 import cv2
 import numpy as np
 
diff --git a/datumaro/cli/contexts/source.py b/datumaro/cli/contexts/source.py
index caea28446c..54863340fe 100644
--- a/datumaro/cli/contexts/source.py
+++ b/datumaro/cli/contexts/source.py
@@ -9,7 +9,8 @@
 import shutil
 
 from datumaro.components.project import Environment
-from ..util import add_subparser, CliException, MultilineFormatter
+
+from ..util import CliException, MultilineFormatter, add_subparser
 from ..util.project import load_project
 
 
diff --git a/datumaro/cli/util/__init__.py b/datumaro/cli/util/__init__.py
index 0a4357f700..7fdded9cf9 100644
--- a/datumaro/cli/util/__init__.py
+++ b/datumaro/cli/util/__init__.py
@@ -68,7 +68,8 @@ def make_file_name(s):
     Normalizes string, converts to lowercase, removes non-alpha characters,
     and converts spaces to hyphens.
     """
-    import unicodedata, re
+    import re
+    import unicodedata
     s = unicodedata.normalize('NFKD', s).encode('ascii', 'ignore')
     s = s.decode()
     s = re.sub(r'[^\w\s-]', '', s).strip().lower()
diff --git a/datumaro/components/algorithms/rise.py b/datumaro/components/algorithms/rise.py
index 0a4c39d8a2..f2ffd4604d 100644
--- a/datumaro/components/algorithms/rise.py
+++ b/datumaro/components/algorithms/rise.py
@@ -6,6 +6,7 @@
 # pylint: disable=unused-variable
 
 from math import ceil
+
 import numpy as np
 
 from datumaro.components.extractor import AnnotationType
diff --git a/datumaro/components/cli_plugin.py b/datumaro/components/cli_plugin.py
index ca23de1b4d..76b54be197 100644
--- a/datumaro/components/cli_plugin.py
+++ b/datumaro/components/cli_plugin.py
@@ -20,10 +20,11 @@ def _get_name(cls):
     def _get_doc(cls):
         doc = getattr(cls, '__doc__', "")
         if doc:
-            from datumaro.components.launcher import Launcher
-            from datumaro.components.extractor import Extractor, Transform, \
-                Importer
             from datumaro.components.converter import Converter
+            from datumaro.components.extractor import (
+                Extractor, Importer, Transform,
+            )
+            from datumaro.components.launcher import Launcher
             base_classes = [Launcher, Extractor, Transform, Importer, Converter]
 
             if any(getattr(t, '__doc__', '') == doc for t in base_classes):
diff --git a/datumaro/components/config_model.py b/datumaro/components/config_model.py
index 49f85e9133..8cc536b969 100644
--- a/datumaro/components/config_model.py
+++ b/datumaro/components/config_model.py
@@ -3,10 +3,9 @@
 #
 # SPDX-License-Identifier: MIT
 
-from datumaro.components.config import Config, \
-    DictConfig as _DictConfig, \
-    SchemaBuilder as _SchemaBuilder
-
+from datumaro.components.config import Config
+from datumaro.components.config import DictConfig as _DictConfig
+from datumaro.components.config import SchemaBuilder as _SchemaBuilder
 
 SOURCE_SCHEMA = _SchemaBuilder() \
     .add('url', str) \
diff --git a/datumaro/components/converter.py b/datumaro/components/converter.py
index a63f7bd1f7..eafd23da62 100644
--- a/datumaro/components/converter.py
+++ b/datumaro/components/converter.py
@@ -9,7 +9,7 @@
 import shutil
 
 from datumaro.components.cli_plugin import CliPlugin
-from datumaro.util.image import save_image, ByteImage
+from datumaro.util.image import ByteImage, save_image
 
 
 class Converter(CliPlugin):
diff --git a/datumaro/components/dataset.py b/datumaro/components/dataset.py
index 2f05b2f75d..3be34a4a43 100644
--- a/datumaro/components/dataset.py
+++ b/datumaro/components/dataset.py
@@ -2,28 +2,30 @@
 #
 # SPDX-License-Identifier: MIT
 
-from copy import copy
 from contextlib import contextmanager
+from copy import copy
 from enum import Enum, auto
-from typing import Any, Iterable, Iterator, Optional, Tuple, Union, Dict, List
-import logging as log
+from typing import Any, Dict, Iterable, Iterator, List, Optional, Tuple, Union
 import inspect
+import logging as log
 import os
 import os.path as osp
 import shutil
 
-from datumaro.components.dataset_filter import \
-    XPathDatasetFilter, XPathAnnotationsFilter
-from datumaro.components.extractor import (CategoriesInfo, Extractor,
-    IExtractor, ItemTransform, LabelCategories, AnnotationType, DatasetItem,
-    DEFAULT_SUBSET_NAME, Transform)
+from datumaro.components.dataset_filter import (
+    XPathAnnotationsFilter, XPathDatasetFilter,
+)
 from datumaro.components.environment import Environment
-from datumaro.components.errors import (CategoriesRedefinedError,
-    DatumaroError, RepeatedItemError)
+from datumaro.components.errors import (
+    CategoriesRedefinedError, DatumaroError, RepeatedItemError,
+)
+from datumaro.components.extractor import (
+    DEFAULT_SUBSET_NAME, AnnotationType, CategoriesInfo, DatasetItem, Extractor,
+    IExtractor, ItemTransform, LabelCategories, Transform,
+)
 from datumaro.util import error_rollback, is_member_redefined
 from datumaro.util.log_utils import logging_disabled
 
-
 DEFAULT_FORMAT = 'datumaro'
 
 IDataset = IExtractor
diff --git a/datumaro/components/dataset_filter.py b/datumaro/components/dataset_filter.py
index fbaf60c5ce..dd06919edd 100644
--- a/datumaro/components/dataset_filter.py
+++ b/datumaro/components/dataset_filter.py
@@ -4,10 +4,12 @@
 # SPDX-License-Identifier: MIT
 
 import logging as log
-from lxml import etree as ET # lxml has proper XPath implementation
-from datumaro.components.extractor import (ItemTransform,
-    Annotation, AnnotationType,
-    Label, Mask, Points, Polygon, PolyLine, Bbox, Caption,
+
+from lxml import etree as ET  # lxml has proper XPath implementation
+
+from datumaro.components.extractor import (
+    Annotation, AnnotationType, Bbox, Caption, ItemTransform, Label, Mask,
+    Points, Polygon, PolyLine,
 )
 
 
diff --git a/datumaro/components/environment.py b/datumaro/components/environment.py
index 4d1bca7042..0170bf979d 100644
--- a/datumaro/components/environment.py
+++ b/datumaro/components/environment.py
@@ -4,11 +4,12 @@
 
 from functools import partial
 from glob import glob
+from typing import Dict, Iterable
 import inspect
 import logging as log
 import os
 import os.path as osp
-from typing import Dict, Iterable
+
 import git
 
 from datumaro.components.config import Config
@@ -112,7 +113,8 @@ class Environment:
 
     def __init__(self, config=None):
         from datumaro.components.project import (
-            PROJECT_DEFAULT_CONFIG, PROJECT_SCHEMA)
+            PROJECT_DEFAULT_CONFIG, PROJECT_SCHEMA,
+        )
         config = Config(config,
             fallback=PROJECT_DEFAULT_CONFIG, schema=PROJECT_SCHEMA)
 
@@ -128,8 +130,9 @@ def _filter(accept, skip=None):
             return lambda t: issubclass(t, accept) and t not in skip
 
         from datumaro.components.converter import Converter
-        from datumaro.components.extractor import (Importer, Extractor,
-            SourceExtractor, Transform, ItemTransform)
+        from datumaro.components.extractor import (
+            Extractor, Importer, ItemTransform, SourceExtractor, Transform,
+        )
         from datumaro.components.launcher import Launcher
         self._extractors = PluginRegistry(_filter(Extractor,
             skip=SourceExtractor))
@@ -207,8 +210,9 @@ def _import_module(cls, module_dir, module_name, types, package=None):
     def _load_plugins(cls, plugins_dir, types=None):
         if not types:
             from datumaro.components.converter import Converter
-            from datumaro.components.extractor import (Extractor, Importer,
-                Transform)
+            from datumaro.components.extractor import (
+                Extractor, Importer, Transform,
+            )
             from datumaro.components.launcher import Launcher
             types = [Extractor, Converter, Importer, Launcher, Transform]
 
diff --git a/datumaro/components/extractor.py b/datumaro/components/extractor.py
index ea5a447ac6..0b6c81b6a0 100644
--- a/datumaro/components/extractor.py
+++ b/datumaro/components/extractor.py
@@ -5,16 +5,16 @@
 
 from enum import Enum, auto
 from glob import iglob
-from typing import Callable, Iterable, List, Dict, Optional
+from typing import Callable, Dict, Iterable, List, Optional
 import os
 import os.path as osp
 
-from attr import attrs, attrib
+from attr import attrib, attrs
 import attr
 import numpy as np
 
+from datumaro.util.attrs_util import default_if_none, not_empty
 from datumaro.util.image import Image
-from datumaro.util.attrs_util import not_empty, default_if_none
 
 
 class AnnotationType(Enum):
@@ -655,7 +655,7 @@ def find_sources(cls, path) -> List[Dict]:
         raise NotImplementedError()
 
     def __call__(self, path, **extra_params):
-        from datumaro.components.project import Project # cyclic import
+        from datumaro.components.project import Project  # cyclic import
         project = Project()
 
         sources = self.find_sources(osp.normpath(path))
diff --git a/datumaro/components/launcher.py b/datumaro/components/launcher.py
index 8f05b36bee..9e376b14ba 100644
--- a/datumaro/components/launcher.py
+++ b/datumaro/components/launcher.py
@@ -5,8 +5,9 @@
 
 import numpy as np
 
-from datumaro.components.extractor import (Transform, LabelCategories,
-    AnnotationType)
+from datumaro.components.extractor import (
+    AnnotationType, LabelCategories, Transform,
+)
 from datumaro.util import take_by
 
 
diff --git a/datumaro/components/operations.py b/datumaro/components/operations.py
index 00ba14394c..bb95d884c2 100644
--- a/datumaro/components/operations.py
+++ b/datumaro/components/operations.py
@@ -4,27 +4,32 @@
 
 from collections import OrderedDict
 from copy import deepcopy
+from unittest import TestCase
 import hashlib
 import logging as log
-from unittest import TestCase
 
+from attr import attrib, attrs
 import attr
 import cv2
 import numpy as np
-from attr import attrib, attrs
 
 from datumaro.components.cli_plugin import CliPlugin
-from datumaro.util import find, filter_dict
-from datumaro.components.extractor import (AnnotationType, Bbox,
-    CategoriesInfo, Label,
-    LabelCategories, PointsCategories, MaskCategories)
-from datumaro.components.errors import (DatumaroError, FailedAttrVotingError,
-    FailedLabelVotingError, MismatchingImageInfoError, NoMatchingAnnError,
-    NoMatchingItemError, AnnotationsTooCloseError, WrongGroupError)
 from datumaro.components.dataset import Dataset, DatasetItemStorage
-from datumaro.util.attrs_util import ensure_cls, default_if_none
-from datumaro.util.annotation_util import (segment_iou, bbox_iou,
-    mean_bbox, OKS, find_instances, max_bbox, smooth_line)
+from datumaro.components.errors import (
+    AnnotationsTooCloseError, DatumaroError, FailedAttrVotingError,
+    FailedLabelVotingError, MismatchingImageInfoError, NoMatchingAnnError,
+    NoMatchingItemError, WrongGroupError,
+)
+from datumaro.components.extractor import (
+    AnnotationType, Bbox, CategoriesInfo, Label, LabelCategories,
+    MaskCategories, PointsCategories,
+)
+from datumaro.util import filter_dict, find
+from datumaro.util.annotation_util import (
+    OKS, bbox_iou, find_instances, max_bbox, mean_bbox, segment_iou,
+    smooth_line,
+)
+from datumaro.util.attrs_util import default_if_none, ensure_cls
 
 
 def get_ann_type(anns, t):
diff --git a/datumaro/components/project.py b/datumaro/components/project.py
index 4d0cc4a793..8996ffce92 100644
--- a/datumaro/components/project.py
+++ b/datumaro/components/project.py
@@ -9,11 +9,13 @@
 import shutil
 
 from datumaro.components.config import Config
-from datumaro.components.config_model import (Model, Source,
-    PROJECT_DEFAULT_CONFIG, PROJECT_SCHEMA)
-from datumaro.components.dataset import (IDataset, Dataset, DEFAULT_FORMAT)
-from datumaro.components.dataset_filter import (XPathAnnotationsFilter,
-    XPathDatasetFilter)
+from datumaro.components.config_model import (
+    PROJECT_DEFAULT_CONFIG, PROJECT_SCHEMA, Model, Source,
+)
+from datumaro.components.dataset import DEFAULT_FORMAT, Dataset, IDataset
+from datumaro.components.dataset_filter import (
+    XPathAnnotationsFilter, XPathDatasetFilter,
+)
 from datumaro.components.environment import Environment
 from datumaro.components.errors import DatumaroError
 from datumaro.components.extractor import DEFAULT_SUBSET_NAME, Extractor
diff --git a/datumaro/plugins/accuracy_checker_plugin/details/ac.py b/datumaro/plugins/accuracy_checker_plugin/details/ac.py
index 2a60f41a7f..63ce0c5fdb 100644
--- a/datumaro/plugins/accuracy_checker_plugin/details/ac.py
+++ b/datumaro/plugins/accuracy_checker_plugin/details/ac.py
@@ -3,7 +3,8 @@
 #
 # SPDX-License-Identifier: MIT
 
-from datumaro.util.tf_util import import_tf # pylint: disable=wrong-import-order
+from datumaro.util.tf_util import import_tf
+
 import_tf() # prevent TF loading and potential interpreter crash
 
 from itertools import groupby
diff --git a/datumaro/plugins/accuracy_checker_plugin/details/representation.py b/datumaro/plugins/accuracy_checker_plugin/details/representation.py
index 5324710188..94659e7aec 100644
--- a/datumaro/plugins/accuracy_checker_plugin/details/representation.py
+++ b/datumaro/plugins/accuracy_checker_plugin/details/representation.py
@@ -3,13 +3,15 @@
 #
 # SPDX-License-Identifier: MIT
 
-from datumaro.util.tf_util import import_tf # pylint: disable=wrong-import-order
+from datumaro.util.tf_util import import_tf
+
 import_tf() # prevent TF loading and potential interpreter crash
 
 import accuracy_checker.representation as ac
 
-import datumaro.components.extractor as dm
 from datumaro.util.annotation_util import softmax
+import datumaro.components.extractor as dm
+
 
 def import_predictions(predictions):
     # Convert Accuracy checker predictions to Datumaro annotations
diff --git a/datumaro/plugins/accuracy_checker_plugin/launcher.py b/datumaro/plugins/accuracy_checker_plugin/launcher.py
index 4d94a3b4b5..3ae367aeb8 100644
--- a/datumaro/plugins/accuracy_checker_plugin/launcher.py
+++ b/datumaro/plugins/accuracy_checker_plugin/launcher.py
@@ -4,6 +4,7 @@
 # SPDX-License-Identifier: MIT
 
 import os.path as osp
+
 import yaml
 
 from datumaro.components.cli_plugin import CliPlugin
diff --git a/datumaro/plugins/camvid_format.py b/datumaro/plugins/camvid_format.py
index ee05d7b1aa..cbb483f9bd 100644
--- a/datumaro/plugins/camvid_format.py
+++ b/datumaro/plugins/camvid_format.py
@@ -3,18 +3,19 @@
 #
 # SPDX-License-Identifier: MIT
 
+from collections import OrderedDict
+from enum import Enum, auto
 import logging as log
 import os
 import os.path as osp
-from collections import OrderedDict
-from enum import Enum, auto
 
 import numpy as np
 
 from datumaro.components.converter import Converter
-from datumaro.components.extractor import (AnnotationType, CompiledMask,
-    DatasetItem, Importer, LabelCategories, Mask,
-    MaskCategories, SourceExtractor)
+from datumaro.components.extractor import (
+    AnnotationType, CompiledMask, DatasetItem, Importer, LabelCategories, Mask,
+    MaskCategories, SourceExtractor,
+)
 from datumaro.util import find, str_to_bool
 from datumaro.util.annotation_util import make_label_id_mapping
 from datumaro.util.image import save_image
diff --git a/datumaro/plugins/cifar_format.py b/datumaro/plugins/cifar_format.py
index 8212911710..b4dcdc616e 100644
--- a/datumaro/plugins/cifar_format.py
+++ b/datumaro/plugins/cifar_format.py
@@ -4,12 +4,15 @@
 
 import os
 import os.path as osp
-import pickle # nosec - disable B403:import_pickle check
+import pickle  # nosec - disable B403:import_pickle check
 
 import numpy as np
+
 from datumaro.components.converter import Converter
-from datumaro.components.extractor import (AnnotationType, DatasetItem,
-    Importer, Label, LabelCategories, SourceExtractor)
+from datumaro.components.extractor import (
+    AnnotationType, DatasetItem, Importer, Label, LabelCategories,
+    SourceExtractor,
+)
 from datumaro.util import cast
 
 
diff --git a/datumaro/plugins/cityscapes_format.py b/datumaro/plugins/cityscapes_format.py
index 64d5eb2a41..dbee3fd171 100644
--- a/datumaro/plugins/cityscapes_format.py
+++ b/datumaro/plugins/cityscapes_format.py
@@ -3,25 +3,25 @@
 #
 # SPDX-License-Identifier: MIT
 
-import logging as log
-import os
-import os.path as osp
 from collections import OrderedDict
 from enum import Enum, auto
 from glob import iglob
+import logging as log
+import os
+import os.path as osp
 
 import numpy as np
 
 from datumaro.components.converter import Converter
-from datumaro.components.extractor import (AnnotationType, CompiledMask,
-    DatasetItem, Importer, LabelCategories, Mask,
-    MaskCategories, SourceExtractor)
+from datumaro.components.extractor import (
+    AnnotationType, CompiledMask, DatasetItem, Importer, LabelCategories, Mask,
+    MaskCategories, SourceExtractor,
+)
 from datumaro.util import str_to_bool
 from datumaro.util.annotation_util import make_label_id_mapping
-from datumaro.util.image import save_image, load_image
+from datumaro.util.image import load_image, save_image
 from datumaro.util.mask_tools import generate_colormap, paint_mask
 
-
 CityscapesLabelMap = OrderedDict([
     ('unlabeled', (0, 0, 0)),
     ('egovehicle', (0, 0, 0)),
diff --git a/datumaro/plugins/coco_format/converter.py b/datumaro/plugins/coco_format/converter.py
index aadb8e1519..4d444a2165 100644
--- a/datumaro/plugins/coco_format/converter.py
+++ b/datumaro/plugins/coco_format/converter.py
@@ -3,27 +3,29 @@
 #
 # SPDX-License-Identifier: MIT
 
+from enum import Enum, auto
+from itertools import chain, groupby
 import json
 import logging as log
 import os
 import os.path as osp
-from enum import Enum, auto
-from itertools import chain, groupby
-import numpy as np
 
+import numpy as np
 import pycocotools.mask as mask_utils
 
-import datumaro.util.annotation_util as anno_tools
-import datumaro.util.mask_tools as mask_tools
 from datumaro.components.converter import Converter
-from datumaro.components.extractor import (DatasetItem,
-    _COORDINATE_ROUNDING_DIGITS, AnnotationType, Points)
 from datumaro.components.dataset import ItemStatus
+from datumaro.components.extractor import (
+    _COORDINATE_ROUNDING_DIGITS, AnnotationType, DatasetItem, Points,
+)
 from datumaro.util import cast, find, str_to_bool
 from datumaro.util.image import save_image
+import datumaro.util.annotation_util as anno_tools
+import datumaro.util.mask_tools as mask_tools
 
 from .format import CocoPath, CocoTask
 
+
 class SegmentationMode(Enum):
     guess = auto()
     polygons = auto()
diff --git a/datumaro/plugins/coco_format/extractor.py b/datumaro/plugins/coco_format/extractor.py
index a2210dfa8a..303f0e1333 100644
--- a/datumaro/plugins/coco_format/extractor.py
+++ b/datumaro/plugins/coco_format/extractor.py
@@ -11,15 +11,15 @@
 from pycocotools.coco import COCO
 import pycocotools.mask as mask_utils
 
-from datumaro.components.extractor import (CompiledMask, Mask, SourceExtractor,
-    DEFAULT_SUBSET_NAME, DatasetItem,
-    AnnotationType, Label, RleMask, Points, Polygon, Bbox, Caption,
-    LabelCategories, PointsCategories
+from datumaro.components.extractor import (
+    DEFAULT_SUBSET_NAME, AnnotationType, Bbox, Caption, CompiledMask,
+    DatasetItem, Label, LabelCategories, Mask, Points, PointsCategories,
+    Polygon, RleMask, SourceExtractor,
 )
 from datumaro.util.image import Image, lazy_image, load_image
 from datumaro.util.mask_tools import bgr2index
 
-from .format import CocoTask, CocoPath
+from .format import CocoPath, CocoTask
 
 
 class _CocoExtractor(SourceExtractor):
diff --git a/datumaro/plugins/coco_format/importer.py b/datumaro/plugins/coco_format/importer.py
index f2c68a1f74..ca76dc55db 100644
--- a/datumaro/plugins/coco_format/importer.py
+++ b/datumaro/plugins/coco_format/importer.py
@@ -31,7 +31,7 @@ def detect(cls, path):
             return len(cls.find_sources(path)) != 0
 
     def __call__(self, path, **extra_params):
-        from datumaro.components.project import Project # cyclic import
+        from datumaro.components.project import Project  # cyclic import
         project = Project()
 
         subsets = self.find_sources(path)
diff --git a/datumaro/plugins/cvat_format/converter.py b/datumaro/plugins/cvat_format/converter.py
index 08bf85f58b..0257ea3bf1 100644
--- a/datumaro/plugins/cvat_format/converter.py
+++ b/datumaro/plugins/cvat_format/converter.py
@@ -3,17 +3,18 @@
 #
 # SPDX-License-Identifier: MIT
 
-import logging as log
-import os
-import os.path as osp
 from collections import OrderedDict
 from itertools import chain
 from xml.sax.saxutils import XMLGenerator
+import logging as log
+import os
+import os.path as osp
 
 from datumaro.components.converter import Converter
 from datumaro.components.dataset import ItemStatus
-from datumaro.components.extractor import (AnnotationType, DatasetItem,
-    LabelCategories)
+from datumaro.components.extractor import (
+    AnnotationType, DatasetItem, LabelCategories,
+)
 from datumaro.util import cast, pairs
 
 from .format import CvatPath
diff --git a/datumaro/plugins/cvat_format/extractor.py b/datumaro/plugins/cvat_format/extractor.py
index 466ab96a95..cf17cbf995 100644
--- a/datumaro/plugins/cvat_format/extractor.py
+++ b/datumaro/plugins/cvat_format/extractor.py
@@ -5,11 +5,12 @@
 
 from collections import OrderedDict
 import os.path as osp
+
 from defusedxml import ElementTree
 
-from datumaro.components.extractor import (SourceExtractor, DatasetItem,
-    AnnotationType, Points, Polygon, PolyLine, Bbox, Label,
-    LabelCategories, Importer
+from datumaro.components.extractor import (
+    AnnotationType, Bbox, DatasetItem, Importer, Label, LabelCategories, Points,
+    Polygon, PolyLine, SourceExtractor,
 )
 from datumaro.util.image import Image
 
diff --git a/datumaro/plugins/datumaro_format/converter.py b/datumaro/plugins/datumaro_format/converter.py
index 45cc4c75f6..787fe9f555 100644
--- a/datumaro/plugins/datumaro_format/converter.py
+++ b/datumaro/plugins/datumaro_format/converter.py
@@ -8,15 +8,16 @@
 import json
 import os
 import os.path as osp
-import numpy as np
 
+import numpy as np
 import pycocotools.mask as mask_utils
+
 from datumaro.components.converter import Converter
 from datumaro.components.dataset import ItemStatus
 from datumaro.components.extractor import (
-    DEFAULT_SUBSET_NAME, Annotation, DatasetItem, _Shape,
-    Label, Mask, RleMask, Points, Polygon, PolyLine, Bbox, Caption,
-    LabelCategories, MaskCategories, PointsCategories
+    DEFAULT_SUBSET_NAME, Annotation, Bbox, Caption, DatasetItem, Label,
+    LabelCategories, Mask, MaskCategories, Points, PointsCategories, Polygon,
+    PolyLine, RleMask, _Shape,
 )
 from datumaro.util import cast
 
diff --git a/datumaro/plugins/datumaro_format/extractor.py b/datumaro/plugins/datumaro_format/extractor.py
index 8b4799c927..cf1c642b5e 100644
--- a/datumaro/plugins/datumaro_format/extractor.py
+++ b/datumaro/plugins/datumaro_format/extractor.py
@@ -6,9 +6,10 @@
 import json
 import os.path as osp
 
-from datumaro.components.extractor import (SourceExtractor, DatasetItem,
-    AnnotationType, Label, RleMask, Points, Polygon, PolyLine, Bbox, Caption,
-    LabelCategories, MaskCategories, PointsCategories, Importer
+from datumaro.components.extractor import (
+    AnnotationType, Bbox, Caption, DatasetItem, Importer, Label,
+    LabelCategories, MaskCategories, Points, PointsCategories, Polygon,
+    PolyLine, RleMask, SourceExtractor,
 )
 from datumaro.util.image import Image
 
diff --git a/datumaro/plugins/icdar_format/extractor.py b/datumaro/plugins/icdar_format/extractor.py
index bc6f4e91c4..7bc85d9f7f 100644
--- a/datumaro/plugins/icdar_format/extractor.py
+++ b/datumaro/plugins/icdar_format/extractor.py
@@ -7,8 +7,10 @@
 
 import numpy as np
 
-from datumaro.components.extractor import (Bbox, Caption, DatasetItem,
-    Importer, Mask, MaskCategories, Polygon, SourceExtractor)
+from datumaro.components.extractor import (
+    Bbox, Caption, DatasetItem, Importer, Mask, MaskCategories, Polygon,
+    SourceExtractor,
+)
 from datumaro.util.image import find_images
 from datumaro.util.mask_tools import lazy_mask
 
diff --git a/datumaro/plugins/image_dir_format.py b/datumaro/plugins/image_dir_format.py
index 3cca401a43..c8d52f03e5 100644
--- a/datumaro/plugins/image_dir_format.py
+++ b/datumaro/plugins/image_dir_format.py
@@ -7,8 +7,8 @@
 import os
 import os.path as osp
 
-from datumaro.components.extractor import DatasetItem, SourceExtractor, Importer
 from datumaro.components.converter import Converter
+from datumaro.components.extractor import DatasetItem, Importer, SourceExtractor
 from datumaro.util.image import find_images
 
 
diff --git a/datumaro/plugins/image_zip_format.py b/datumaro/plugins/image_zip_format.py
index 834a766a6d..5b0bd59898 100644
--- a/datumaro/plugins/image_zip_format.py
+++ b/datumaro/plugins/image_zip_format.py
@@ -3,17 +3,17 @@
 # SPDX-License-Identifier: MIT
 
 from enum import Enum
+from zipfile import ZIP_BZIP2, ZIP_DEFLATED, ZIP_LZMA, ZIP_STORED, ZipFile
 import logging as log
 import os
 import os.path as osp
-from zipfile import ZIP_BZIP2, ZIP_DEFLATED, ZIP_LZMA, ZIP_STORED, ZipFile
 
 from datumaro.components.converter import Converter
 from datumaro.components.extractor import DatasetItem, Importer, SourceExtractor
-
 from datumaro.util import parse_str_enum_value
 from datumaro.util.image import IMAGE_EXTENSIONS, ByteImage, encode_image
 
+
 class Compression(Enum):
     ZIP_STORED = ZIP_STORED
     ZIP_DEFLATED = ZIP_DEFLATED
diff --git a/datumaro/plugins/imagenet_format.py b/datumaro/plugins/imagenet_format.py
index 9254662d06..b9223a33fa 100644
--- a/datumaro/plugins/imagenet_format.py
+++ b/datumaro/plugins/imagenet_format.py
@@ -6,10 +6,11 @@
 import os
 import os.path as osp
 
-from datumaro.components.extractor import (DatasetItem, Label,
-    LabelCategories, AnnotationType, SourceExtractor, Importer
-)
 from datumaro.components.converter import Converter
+from datumaro.components.extractor import (
+    AnnotationType, DatasetItem, Importer, Label, LabelCategories,
+    SourceExtractor,
+)
 from datumaro.util.image import find_images
 
 
diff --git a/datumaro/plugins/imagenet_txt_format.py b/datumaro/plugins/imagenet_txt_format.py
index d50148956f..a66868d408 100644
--- a/datumaro/plugins/imagenet_txt_format.py
+++ b/datumaro/plugins/imagenet_txt_format.py
@@ -6,10 +6,11 @@
 import os
 import os.path as osp
 
-from datumaro.components.extractor import (DatasetItem, Label,
-    LabelCategories, AnnotationType, SourceExtractor, Importer
-)
 from datumaro.components.converter import Converter
+from datumaro.components.extractor import (
+    AnnotationType, DatasetItem, Importer, Label, LabelCategories,
+    SourceExtractor,
+)
 
 
 class ImagenetTxtPath:
diff --git a/datumaro/plugins/kitti_format/converter.py b/datumaro/plugins/kitti_format/converter.py
index 661d642891..a11c485211 100644
--- a/datumaro/plugins/kitti_format/converter.py
+++ b/datumaro/plugins/kitti_format/converter.py
@@ -3,27 +3,29 @@
 #
 # SPDX-License-Identifier: MIT
 
+from collections import OrderedDict
+from enum import Enum, auto
 import logging as log
 import os
 import os.path as osp
-from collections import OrderedDict
-from enum import Enum, auto
 
 import numpy as np
 
 from datumaro.components.converter import Converter
-from datumaro.components.extractor import (AnnotationType,
-    CompiledMask, LabelCategories)
-from datumaro.util import parse_str_enum_value, str_to_bool, cast
+from datumaro.components.extractor import (
+    AnnotationType, CompiledMask, LabelCategories,
+)
+from datumaro.util import cast, parse_str_enum_value, str_to_bool
 from datumaro.util.annotation_util import make_label_id_mapping
 from datumaro.util.image import save_image
 from datumaro.util.mask_tools import paint_mask
 
-from .format import (KittiTask, KittiPath, KittiLabelMap,
-    make_kitti_categories, make_kitti_detection_categories,
-    parse_label_map, write_label_map,
+from .format import (
+    KittiLabelMap, KittiPath, KittiTask, make_kitti_categories,
+    make_kitti_detection_categories, parse_label_map, write_label_map,
 )
 
+
 class LabelmapType(Enum):
     kitti = auto()
     source = auto()
diff --git a/datumaro/plugins/kitti_format/extractor.py b/datumaro/plugins/kitti_format/extractor.py
index f9ad6fd6fc..7478587671 100644
--- a/datumaro/plugins/kitti_format/extractor.py
+++ b/datumaro/plugins/kitti_format/extractor.py
@@ -6,15 +6,17 @@
 
 import numpy as np
 
-from datumaro.components.extractor import (SourceExtractor,
-    AnnotationType, DatasetItem, Mask, Bbox)
-from datumaro.util.image import load_image, find_images
+from datumaro.components.extractor import (
+    AnnotationType, Bbox, DatasetItem, Mask, SourceExtractor,
+)
+from datumaro.util.image import find_images, load_image
 
 from .format import (
-    KittiTask, KittiPath, KittiLabelMap, parse_label_map,
-    make_kitti_categories, make_kitti_detection_categories
+    KittiLabelMap, KittiPath, KittiTask, make_kitti_categories,
+    make_kitti_detection_categories, parse_label_map,
 )
 
+
 class _KittiExtractor(SourceExtractor):
     def __init__(self, path, task, subset=None):
         assert osp.isdir(path), path
diff --git a/datumaro/plugins/kitti_format/format.py b/datumaro/plugins/kitti_format/format.py
index 512eaa453a..5bcfdb79d8 100644
--- a/datumaro/plugins/kitti_format/format.py
+++ b/datumaro/plugins/kitti_format/format.py
@@ -6,10 +6,9 @@
 from collections import OrderedDict
 from enum import Enum, auto
 
-from datumaro.components.extractor import (AnnotationType,
-    LabelCategories, MaskCategories
+from datumaro.components.extractor import (
+    AnnotationType, LabelCategories, MaskCategories,
 )
-
 from datumaro.util.mask_tools import generate_colormap
 
 
diff --git a/datumaro/plugins/kitti_format/importer.py b/datumaro/plugins/kitti_format/importer.py
index b9e40d73cf..669896c98c 100644
--- a/datumaro/plugins/kitti_format/importer.py
+++ b/datumaro/plugins/kitti_format/importer.py
@@ -10,7 +10,8 @@
 from datumaro.components.extractor import Importer
 from datumaro.util.log_utils import logging_disabled
 
-from .format import KittiTask, KittiPath
+from .format import KittiPath, KittiTask
+
 
 class KittiImporter(Importer):
     _TASKS = {
@@ -24,7 +25,7 @@ def detect(cls, path):
             return len(cls.find_sources(path)) != 0
 
     def __call__(self, path, **extra_params):
-        from datumaro.components.project import Project # cyclic import
+        from datumaro.components.project import Project  # cyclic import
         project = Project()
 
         subsets = self.find_sources(path)
diff --git a/datumaro/plugins/labelme_format.py b/datumaro/plugins/labelme_format.py
index 8c6fc3c3e8..f95daf4aea 100644
--- a/datumaro/plugins/labelme_format.py
+++ b/datumaro/plugins/labelme_format.py
@@ -8,16 +8,19 @@
 import logging as log
 import os
 import os.path as osp
+
 from defusedxml import ElementTree
 import numpy as np
 
-from datumaro.components.extractor import (Extractor, Importer,
-    DatasetItem, AnnotationType, Mask, Bbox, Polygon, LabelCategories)
 from datumaro.components.converter import Converter
+from datumaro.components.extractor import (
+    AnnotationType, Bbox, DatasetItem, Extractor, Importer, LabelCategories,
+    Mask, Polygon,
+)
 from datumaro.util import cast, escape, unescape
-from datumaro.util.os_util import split_path
 from datumaro.util.image import Image, save_image
-from datumaro.util.mask_tools import load_mask, find_mask_bbox
+from datumaro.util.mask_tools import find_mask_bbox, load_mask
+from datumaro.util.os_util import split_path
 
 
 class LabelMePath:
diff --git a/datumaro/plugins/lfw_format.py b/datumaro/plugins/lfw_format.py
index 004c4e9315..59aef70ec3 100644
--- a/datumaro/plugins/lfw_format.py
+++ b/datumaro/plugins/lfw_format.py
@@ -7,8 +7,10 @@
 import re
 
 from datumaro.components.converter import Converter
-from datumaro.components.extractor import (AnnotationType, DatasetItem,
-    Importer, Label, LabelCategories, Points, SourceExtractor)
+from datumaro.components.extractor import (
+    AnnotationType, DatasetItem, Importer, Label, LabelCategories, Points,
+    SourceExtractor,
+)
 from datumaro.util.image import find_images
 
 
diff --git a/datumaro/plugins/market1501_format.py b/datumaro/plugins/market1501_format.py
index 2493b495bc..5f2cbfe138 100644
--- a/datumaro/plugins/market1501_format.py
+++ b/datumaro/plugins/market1501_format.py
@@ -2,15 +2,14 @@
 #
 # SPDX-License-Identifier: MIT
 
+from distutils.util import strtobool
+from itertools import chain
 import os
 import os.path as osp
 import re
-from distutils.util import strtobool
-from itertools import chain
 
 from datumaro.components.converter import Converter
-from datumaro.components.extractor import (DatasetItem, Importer,
-    SourceExtractor)
+from datumaro.components.extractor import DatasetItem, Importer, SourceExtractor
 from datumaro.util.image import find_images
 
 
diff --git a/datumaro/plugins/mnist_csv_format.py b/datumaro/plugins/mnist_csv_format.py
index ae0fa8bf8c..17e257d263 100644
--- a/datumaro/plugins/mnist_csv_format.py
+++ b/datumaro/plugins/mnist_csv_format.py
@@ -6,9 +6,12 @@
 import os.path as osp
 
 import numpy as np
+
 from datumaro.components.converter import Converter
-from datumaro.components.extractor import (AnnotationType, DatasetItem,
-    Importer, Label, LabelCategories, SourceExtractor)
+from datumaro.components.extractor import (
+    AnnotationType, DatasetItem, Importer, Label, LabelCategories,
+    SourceExtractor,
+)
 
 
 class MnistCsvPath:
diff --git a/datumaro/plugins/mnist_format.py b/datumaro/plugins/mnist_format.py
index 0cd97b06df..2eb4c474bc 100644
--- a/datumaro/plugins/mnist_format.py
+++ b/datumaro/plugins/mnist_format.py
@@ -7,9 +7,12 @@
 import os.path as osp
 
 import numpy as np
+
 from datumaro.components.converter import Converter
-from datumaro.components.extractor import (AnnotationType, DatasetItem,
-    Importer, Label, LabelCategories, SourceExtractor)
+from datumaro.components.extractor import (
+    AnnotationType, DatasetItem, Importer, Label, LabelCategories,
+    SourceExtractor,
+)
 
 
 class MnistPath:
diff --git a/datumaro/plugins/mot_format.py b/datumaro/plugins/mot_format.py
index 8008f25d2b..abd1e95fc7 100644
--- a/datumaro/plugins/mot_format.py
+++ b/datumaro/plugins/mot_format.py
@@ -7,20 +7,20 @@
 # Another description: https://motchallenge.net/instructions
 
 from collections import OrderedDict
-import csv
 from enum import Enum
+import csv
 import logging as log
 import os
 import os.path as osp
 
-from datumaro.components.extractor import (SourceExtractor, Importer,
-    DatasetItem, AnnotationType, Bbox, LabelCategories
-)
 from datumaro.components.converter import Converter
+from datumaro.components.extractor import (
+    AnnotationType, Bbox, DatasetItem, Importer, LabelCategories,
+    SourceExtractor,
+)
 from datumaro.util import cast
 from datumaro.util.image import Image, find_images
 
-
 MotLabel = Enum('MotLabel', [
     ('pedestrian', 1),
     ('person on vehicle', 2),
diff --git a/datumaro/plugins/mots_format.py b/datumaro/plugins/mots_format.py
index 7728efd9e1..16a632ba06 100644
--- a/datumaro/plugins/mots_format.py
+++ b/datumaro/plugins/mots_format.py
@@ -9,12 +9,14 @@
 import logging as log
 import os
 import os.path as osp
+
 import numpy as np
 
-from datumaro.components.extractor import (SourceExtractor, Importer,
-    DatasetItem, AnnotationType, Mask, LabelCategories
-)
 from datumaro.components.converter import Converter
+from datumaro.components.extractor import (
+    AnnotationType, DatasetItem, Importer, LabelCategories, Mask,
+    SourceExtractor,
+)
 from datumaro.util.image import find_images, load_image, save_image
 from datumaro.util.mask_tools import merge_masks
 
diff --git a/datumaro/plugins/ndr.py b/datumaro/plugins/ndr.py
index 3f2610d899..cd6f0112e5 100644
--- a/datumaro/plugins/ndr.py
+++ b/datumaro/plugins/ndr.py
@@ -5,12 +5,12 @@
 from enum import Enum, auto
 import logging as log
 
+from scipy.linalg import orth
 import cv2
 import numpy as np
-from scipy.linalg import orth
 
-from datumaro.components.extractor import Transform, DEFAULT_SUBSET_NAME
 from datumaro.components.cli_plugin import CliPlugin
+from datumaro.components.extractor import DEFAULT_SUBSET_NAME, Transform
 from datumaro.util import parse_str_enum_value
 
 
diff --git a/datumaro/plugins/open_images_format.py b/datumaro/plugins/open_images_format.py
index d6b83f33c5..466a5571d2 100644
--- a/datumaro/plugins/open_images_format.py
+++ b/datumaro/plugins/open_images_format.py
@@ -16,9 +16,11 @@
 from attr import attrs
 
 from datumaro.components.converter import Converter
-from datumaro.components.errors import DatasetError, RepeatedItemError, UndefinedLabel
+from datumaro.components.errors import (
+    DatasetError, RepeatedItemError, UndefinedLabel,
+)
 from datumaro.components.extractor import (
-    AnnotationType, DatasetItem, Importer, Label, LabelCategories, Extractor,
+    AnnotationType, DatasetItem, Extractor, Importer, Label, LabelCategories,
 )
 from datumaro.components.validator import Severity
 from datumaro.util.image import find_images
diff --git a/datumaro/plugins/openvino_plugin/launcher.py b/datumaro/plugins/openvino_plugin/launcher.py
index 1617e0f142..a5767afbf4 100644
--- a/datumaro/plugins/openvino_plugin/launcher.py
+++ b/datumaro/plugins/openvino_plugin/launcher.py
@@ -5,13 +5,13 @@
 
 # pylint: disable=exec-used
 
+import logging as log
 import os.path as osp
 import shutil
-import logging as log
-import cv2
-import numpy as np
 
 from openvino.inference_engine import IECore
+import cv2
+import numpy as np
 
 from datumaro.components.cli_plugin import CliPlugin
 from datumaro.components.launcher import Launcher
diff --git a/datumaro/plugins/openvino_plugin/samples/mobilenet_v2_pytorch_interp.py b/datumaro/plugins/openvino_plugin/samples/mobilenet_v2_pytorch_interp.py
index 41df21e466..a765dd42b1 100644
--- a/datumaro/plugins/openvino_plugin/samples/mobilenet_v2_pytorch_interp.py
+++ b/datumaro/plugins/openvino_plugin/samples/mobilenet_v2_pytorch_interp.py
@@ -3,7 +3,7 @@
 # SPDX-License-Identifier: MIT
 
 
-from datumaro.components.extractor import Label, LabelCategories, AnnotationType
+from datumaro.components.extractor import AnnotationType, Label, LabelCategories
 from datumaro.util.annotation_util import softmax
 
 
diff --git a/datumaro/plugins/sampler/sampler.py b/datumaro/plugins/sampler/sampler.py
index 2fefa0e1dc..797fd800a5 100644
--- a/datumaro/plugins/sampler/sampler.py
+++ b/datumaro/plugins/sampler/sampler.py
@@ -6,10 +6,10 @@
 
 import pandas as pd
 
-from datumaro.components.extractor import Transform
 from datumaro.components.cli_plugin import CliPlugin
+from datumaro.components.extractor import Transform
 
-from .algorithm.algorithm import SamplingMethod, Algorithm
+from .algorithm.algorithm import Algorithm, SamplingMethod
 
 
 class Sampler(Transform, CliPlugin):
diff --git a/datumaro/plugins/splitter.py b/datumaro/plugins/splitter.py
index f983715cd8..1a5a1b4d8a 100644
--- a/datumaro/plugins/splitter.py
+++ b/datumaro/plugins/splitter.py
@@ -2,15 +2,17 @@
 #
 # SPDX-License-Identifier: MIT
 
-import logging as log
-import copy
-from math import gcd
 from enum import Enum, auto
+from math import gcd
+import copy
+import logging as log
+
 import numpy as np
 
-from datumaro.components.extractor import (Transform, AnnotationType,
-    DEFAULT_SUBSET_NAME)
 from datumaro.components.cli_plugin import CliPlugin
+from datumaro.components.extractor import (
+    DEFAULT_SUBSET_NAME, AnnotationType, Transform,
+)
 from datumaro.util import cast
 
 NEAR_ZERO = 1e-7
diff --git a/datumaro/plugins/tf_detection_api_format/converter.py b/datumaro/plugins/tf_detection_api_format/converter.py
index d2c8b6317d..c913004179 100644
--- a/datumaro/plugins/tf_detection_api_format/converter.py
+++ b/datumaro/plugins/tf_detection_api_format/converter.py
@@ -3,23 +3,25 @@
 #
 # SPDX-License-Identifier: MIT
 
-import codecs
 from collections import OrderedDict
+import codecs
 import hashlib
 import logging as log
 import os
 import os.path as osp
 import string
 
-from datumaro.components.extractor import (AnnotationType, LabelCategories)
 from datumaro.components.converter import Converter
-from datumaro.util.image import encode_image, ByteImage
-from datumaro.util.annotation_util import (max_bbox,
-    find_group_leader, find_instances)
+from datumaro.components.extractor import AnnotationType, LabelCategories
+from datumaro.util.annotation_util import (
+    find_group_leader, find_instances, max_bbox,
+)
+from datumaro.util.image import ByteImage, encode_image
 from datumaro.util.mask_tools import merge_masks
 from datumaro.util.tf_util import import_tf as _import_tf
 
 from .format import DetectionApiPath
+
 tf = _import_tf()
 
 
diff --git a/datumaro/plugins/tf_detection_api_format/extractor.py b/datumaro/plugins/tf_detection_api_format/extractor.py
index 6b62ac7dee..02d973b4c2 100644
--- a/datumaro/plugins/tf_detection_api_format/extractor.py
+++ b/datumaro/plugins/tf_detection_api_format/extractor.py
@@ -6,15 +6,18 @@
 from collections import OrderedDict
 import os.path as osp
 import re
+
 import numpy as np
 
-from datumaro.components.extractor import (SourceExtractor, DatasetItem,
-    AnnotationType, Bbox, Mask, LabelCategories, Importer
+from datumaro.components.extractor import (
+    AnnotationType, Bbox, DatasetItem, Importer, LabelCategories, Mask,
+    SourceExtractor,
 )
 from datumaro.util.image import ByteImage, decode_image, lazy_image
 from datumaro.util.tf_util import import_tf as _import_tf
 
 from .format import DetectionApiPath
+
 tf = _import_tf()
 
 
diff --git a/datumaro/plugins/transforms.py b/datumaro/plugins/transforms.py
index f901e567ce..7b0ad8b025 100644
--- a/datumaro/plugins/transforms.py
+++ b/datumaro/plugins/transforms.py
@@ -12,14 +12,15 @@
 
 import pycocotools.mask as mask_utils
 
-from datumaro.components.extractor import (ItemTransform, Transform,
-    AnnotationType, RleMask, Polygon, Bbox, Label, DEFAULT_SUBSET_NAME,
-    LabelCategories, MaskCategories, PointsCategories
-)
 from datumaro.components.cli_plugin import CliPlugin
-import datumaro.util.mask_tools as mask_tools
-from datumaro.util import parse_str_enum_value, NOTSET
+from datumaro.components.extractor import (
+    DEFAULT_SUBSET_NAME, AnnotationType, Bbox, ItemTransform, Label,
+    LabelCategories, MaskCategories, PointsCategories, Polygon, RleMask,
+    Transform,
+)
+from datumaro.util import NOTSET, parse_str_enum_value
 from datumaro.util.annotation_util import find_group_leader, find_instances
+import datumaro.util.mask_tools as mask_tools
 
 
 class CropCoveredSegments(ItemTransform, CliPlugin):
diff --git a/datumaro/plugins/validators.py b/datumaro/plugins/validators.py
index c5f936c029..c994724519 100644
--- a/datumaro/plugins/validators.py
+++ b/datumaro/plugins/validators.py
@@ -6,17 +6,17 @@
 
 import numpy as np
 
-from datumaro.components.validator import (Severity, TaskType, Validator)
 from datumaro.components.cli_plugin import CliPlugin
-from datumaro.components.errors import (MissingLabelCategories,
-    MissingAnnotation, MultiLabelAnnotations, MissingAttribute,
-    UndefinedLabel, UndefinedAttribute, LabelDefinedButNotFound,
-    AttributeDefinedButNotFound, OnlyOneLabel, FewSamplesInLabel,
-    FewSamplesInAttribute, ImbalancedLabels, ImbalancedAttribute,
-    ImbalancedDistInLabel, ImbalancedDistInAttribute,
-    NegativeLength, InvalidValue, FarFromLabelMean,
-    FarFromAttrMean, OnlyOneAttributeValue)
+from datumaro.components.errors import (
+    AttributeDefinedButNotFound, FarFromAttrMean, FarFromLabelMean,
+    FewSamplesInAttribute, FewSamplesInLabel, ImbalancedAttribute,
+    ImbalancedDistInAttribute, ImbalancedDistInLabel, ImbalancedLabels,
+    InvalidValue, LabelDefinedButNotFound, MissingAnnotation, MissingAttribute,
+    MissingLabelCategories, MultiLabelAnnotations, NegativeLength,
+    OnlyOneAttributeValue, OnlyOneLabel, UndefinedAttribute, UndefinedLabel,
+)
 from datumaro.components.extractor import AnnotationType, LabelCategories
+from datumaro.components.validator import Severity, TaskType, Validator
 from datumaro.util import parse_str_enum_value
 
 
diff --git a/datumaro/plugins/vgg_face2_format.py b/datumaro/plugins/vgg_face2_format.py
index 33b4102160..d7554f3755 100644
--- a/datumaro/plugins/vgg_face2_format.py
+++ b/datumaro/plugins/vgg_face2_format.py
@@ -7,8 +7,10 @@
 import os.path as osp
 
 from datumaro.components.converter import Converter
-from datumaro.components.extractor import (AnnotationType, Bbox, DatasetItem,
-    Importer, Label, LabelCategories, Points, SourceExtractor)
+from datumaro.components.extractor import (
+    AnnotationType, Bbox, DatasetItem, Importer, Label, LabelCategories, Points,
+    SourceExtractor,
+)
 from datumaro.util.image import find_images
 
 
diff --git a/datumaro/plugins/voc_format/converter.py b/datumaro/plugins/voc_format/converter.py
index ed4b4e6a30..eef5962ba0 100644
--- a/datumaro/plugins/voc_format/converter.py
+++ b/datumaro/plugins/voc_format/converter.py
@@ -3,26 +3,28 @@
 #
 # SPDX-License-Identifier: MIT
 
-import logging as log
-import os
-import os.path as osp
 from collections import OrderedDict, defaultdict
 from enum import Enum, auto
 from itertools import chain
+import logging as log
+import os
+import os.path as osp
 
 from lxml import etree as ET
 
 from datumaro.components.converter import Converter
 from datumaro.components.dataset import ItemStatus
-from datumaro.components.extractor import (AnnotationType,
-    CompiledMask, DatasetItem, LabelCategories)
+from datumaro.components.extractor import (
+    AnnotationType, CompiledMask, DatasetItem, LabelCategories,
+)
 from datumaro.util import find, str_to_bool
 from datumaro.util.annotation_util import make_label_id_mapping
 from datumaro.util.image import save_image
 from datumaro.util.mask_tools import paint_mask, remap_mask
 
-from .format import (VocTask, VocPath, VocInstColormap,
-    parse_label_map, make_voc_label_map, make_voc_categories, write_label_map
+from .format import (
+    VocInstColormap, VocPath, VocTask, make_voc_categories, make_voc_label_map,
+    parse_label_map, write_label_map,
 )
 
 
diff --git a/datumaro/plugins/voc_format/extractor.py b/datumaro/plugins/voc_format/extractor.py
index 4c897e7902..a2febd3900 100644
--- a/datumaro/plugins/voc_format/extractor.py
+++ b/datumaro/plugins/voc_format/extractor.py
@@ -6,21 +6,22 @@
 from collections import defaultdict
 import logging as log
 import os.path as osp
-import numpy as np
+
 from defusedxml import ElementTree
+import numpy as np
 
-from datumaro.components.extractor import (SourceExtractor, DatasetItem,
-    AnnotationType, Label, Mask, Bbox, CompiledMask
+from datumaro.components.extractor import (
+    AnnotationType, Bbox, CompiledMask, DatasetItem, Label, Mask,
+    SourceExtractor,
 )
-from datumaro.util.os_util import dir_items
 from datumaro.util.image import Image, find_images
-from datumaro.util.mask_tools import lazy_mask, invert_colormap
+from datumaro.util.mask_tools import invert_colormap, lazy_mask
+from datumaro.util.os_util import dir_items
 
 from .format import (
-    VocTask, VocPath, VocInstColormap, parse_label_map, make_voc_categories
+    VocInstColormap, VocPath, VocTask, make_voc_categories, parse_label_map,
 )
 
-
 _inverse_inst_colormap = invert_colormap(VocInstColormap)
 
 class _VocExtractor(SourceExtractor):
diff --git a/datumaro/plugins/voc_format/format.py b/datumaro/plugins/voc_format/format.py
index 955fa609b4..6e9025c69f 100644
--- a/datumaro/plugins/voc_format/format.py
+++ b/datumaro/plugins/voc_format/format.py
@@ -6,10 +6,11 @@
 from collections import OrderedDict
 from enum import Enum, auto
 from itertools import chain
+
 import numpy as np
 
-from datumaro.components.extractor import (AnnotationType,
-    LabelCategories, MaskCategories
+from datumaro.components.extractor import (
+    AnnotationType, LabelCategories, MaskCategories,
 )
 
 
diff --git a/datumaro/plugins/voc_format/importer.py b/datumaro/plugins/voc_format/importer.py
index 0268458d40..a9918d8c02 100644
--- a/datumaro/plugins/voc_format/importer.py
+++ b/datumaro/plugins/voc_format/importer.py
@@ -7,7 +7,7 @@
 
 from datumaro.components.extractor import Importer
 
-from .format import VocTask, VocPath
+from .format import VocPath, VocTask
 
 
 class VocImporter(Importer):
@@ -20,7 +20,7 @@ class VocImporter(Importer):
     }
 
     def __call__(self, path, **extra_params):
-        from datumaro.components.project import Project # cyclic import
+        from datumaro.components.project import Project  # cyclic import
         project = Project()
 
         subsets = self.find_sources(path)
diff --git a/datumaro/plugins/widerface_format.py b/datumaro/plugins/widerface_format.py
index a8439dc83c..829bf45026 100644
--- a/datumaro/plugins/widerface_format.py
+++ b/datumaro/plugins/widerface_format.py
@@ -8,8 +8,10 @@
 import re
 
 from datumaro.components.converter import Converter
-from datumaro.components.extractor import (AnnotationType, Bbox, DatasetItem,
-    Importer, Label, LabelCategories, SourceExtractor)
+from datumaro.components.extractor import (
+    AnnotationType, Bbox, DatasetItem, Importer, Label, LabelCategories,
+    SourceExtractor,
+)
 from datumaro.util import str_to_bool
 
 
diff --git a/datumaro/plugins/yolo_format/converter.py b/datumaro/plugins/yolo_format/converter.py
index 88a2f79255..4e768943d9 100644
--- a/datumaro/plugins/yolo_format/converter.py
+++ b/datumaro/plugins/yolo_format/converter.py
@@ -3,15 +3,16 @@
 #
 # SPDX-License-Identifier: MIT
 
+from collections import OrderedDict
 import logging as log
 import os
 import os.path as osp
-from collections import OrderedDict
 
 from datumaro.components.converter import Converter
 from datumaro.components.dataset import ItemStatus
-from datumaro.components.extractor import (AnnotationType, DEFAULT_SUBSET_NAME,
-    DatasetItem)
+from datumaro.components.extractor import (
+    DEFAULT_SUBSET_NAME, AnnotationType, DatasetItem,
+)
 
 from .format import YoloPath
 
diff --git a/datumaro/plugins/yolo_format/extractor.py b/datumaro/plugins/yolo_format/extractor.py
index 4c81e929ee..82df29b0da 100644
--- a/datumaro/plugins/yolo_format/extractor.py
+++ b/datumaro/plugins/yolo_format/extractor.py
@@ -7,11 +7,12 @@
 import os.path as osp
 import re
 
-from datumaro.components.extractor import (SourceExtractor, Extractor,
-    DatasetItem, AnnotationType, Bbox, LabelCategories, Importer
+from datumaro.components.extractor import (
+    AnnotationType, Bbox, DatasetItem, Extractor, Importer, LabelCategories,
+    SourceExtractor,
 )
-from datumaro.util.os_util import split_path
 from datumaro.util.image import Image
+from datumaro.util.os_util import split_path
 
 from .format import YoloPath
 
diff --git a/datumaro/util/annotation_util.py b/datumaro/util/annotation_util.py
index a9e50306dd..aecafaee27 100644
--- a/datumaro/util/annotation_util.py
+++ b/datumaro/util/annotation_util.py
@@ -6,8 +6,9 @@
 
 import numpy as np
 
-from datumaro.components.extractor import (LabelCategories, _Shape, Mask,
-    AnnotationType, RleMask)
+from datumaro.components.extractor import (
+    AnnotationType, LabelCategories, Mask, RleMask, _Shape,
+)
 from datumaro.util.mask_tools import mask_to_rle
 
 
diff --git a/datumaro/util/command_targets.py b/datumaro/util/command_targets.py
index ce79d50b75..eb9fbc9ec2 100644
--- a/datumaro/util/command_targets.py
+++ b/datumaro/util/command_targets.py
@@ -3,8 +3,8 @@
 #
 # SPDX-License-Identifier: MIT
 
-import argparse
 from enum import Enum, auto
+import argparse
 
 from datumaro.components.project import Project
 from datumaro.util.image import load_image
diff --git a/datumaro/util/image.py b/datumaro/util/image.py
index 514d74f052..888f4b574f 100644
--- a/datumaro/util/image.py
+++ b/datumaro/util/image.py
@@ -4,13 +4,15 @@
 # SPDX-License-Identifier: MIT
 
 from enum import Enum, auto
-import importlib
 from io import BytesIO
-from typing import Any, Callable, Iterator, Iterable, Optional, Tuple, Union
+from typing import Any, Callable, Iterable, Iterator, Optional, Tuple, Union
+import importlib
 import os
 import os.path as osp
+
 import numpy as np
 
+
 class _IMAGE_BACKENDS(Enum):
     cv2 = auto()
     PIL = auto()
diff --git a/datumaro/util/image_cache.py b/datumaro/util/image_cache.py
index 08f0258289..e37bd1358e 100644
--- a/datumaro/util/image_cache.py
+++ b/datumaro/util/image_cache.py
@@ -4,7 +4,6 @@
 
 from collections import OrderedDict
 
-
 _instance = None
 
 DEFAULT_CAPACITY = 2
diff --git a/datumaro/util/log_utils.py b/datumaro/util/log_utils.py
index 6c8d8421e7..b4e1c5c7db 100644
--- a/datumaro/util/log_utils.py
+++ b/datumaro/util/log_utils.py
@@ -6,6 +6,7 @@
 from contextlib import contextmanager
 import logging
 
+
 @contextmanager
 def logging_disabled(max_level=logging.CRITICAL):
     previous_level = logging.root.manager.disable
diff --git a/datumaro/util/mask_tools.py b/datumaro/util/mask_tools.py
index cbe477054f..928011515b 100644
--- a/datumaro/util/mask_tools.py
+++ b/datumaro/util/mask_tools.py
@@ -4,6 +4,7 @@
 # SPDX-License-Identifier: MIT
 
 from itertools import chain
+
 import numpy as np
 
 from datumaro.util.image import lazy_image, load_image
diff --git a/datumaro/util/os_util.py b/datumaro/util/os_util.py
index 094329206a..6260f07890 100644
--- a/datumaro/util/os_util.py
+++ b/datumaro/util/os_util.py
@@ -8,7 +8,6 @@
 import subprocess
 import sys
 
-
 DEFAULT_MAX_DEPTH = 10
 
 def check_instruction_set(instruction):
diff --git a/datumaro/util/test_utils.py b/datumaro/util/test_utils.py
index 5476188f5c..cd573243c0 100644
--- a/datumaro/util/test_utils.py
+++ b/datumaro/util/test_utils.py
@@ -12,13 +12,13 @@
     # Use rmtree from GitPython to avoid the problem with removal of
     # readonly files on Windows, which Git uses extensively
     # It double checks if a file cannot be removed because of readonly flag
-    from git.util import rmtree, rmfile
+    from git.util import rmfile, rmtree
 except ImportError:
     from shutil import rmtree
     from os import remove as rmfile
 
-from datumaro.components.extractor import AnnotationType
 from datumaro.components.dataset import Dataset
+from datumaro.components.extractor import AnnotationType
 from datumaro.util import find
 
 
diff --git a/datumaro/util/tf_util.py b/datumaro/util/tf_util.py
index 4461984170..a0fd22e2a9 100644
--- a/datumaro/util/tf_util.py
+++ b/datumaro/util/tf_util.py
@@ -41,7 +41,7 @@ def import_tf(check=None):
     not_found = object()
     tf = sys.modules.get('tensorflow', not_found)
     if tf is None:
-        import tensorflow as tf # emit default error
+        import tensorflow as tf  # emit default error
     elif tf is not not_found:
         return tf
 
diff --git a/requirements.txt b/requirements.txt
index c581bf20c5..fff66a6aa6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,5 +3,8 @@ Cython>=0.27.3 # include before pycocotools
 opencv-python-headless>=4.1.0.25
 pandas>=1.1.5
 pytest>=5.3.5
+
+# linters
 bandit>=1.7.0
+isort~=5.9
 pylint>=2.7.0
diff --git a/setup.py b/setup.py
index a88778db61..dfa124e9bb 100644
--- a/setup.py
+++ b/setup.py
@@ -7,6 +7,7 @@
 import os
 import os.path as osp
 import re
+
 import setuptools
 
 # Snyk scan integration
diff --git a/tests/cli/test_diff.py b/tests/cli/test_diff.py
index 96bf97fa25..b80394021a 100644
--- a/tests/cli/test_diff.py
+++ b/tests/cli/test_diff.py
@@ -1,20 +1,19 @@
 from unittest import TestCase
-
 import os
 import os.path as osp
 
 import numpy as np
 
 from datumaro.cli.contexts.project.diff import DatasetDiffVisualizer
+from datumaro.components.extractor import (
+    AnnotationType, Bbox, Caption, DatasetItem, Label, LabelCategories, Mask,
+    MaskCategories, Points, PointsCategories, Polygon, PolyLine,
+)
 from datumaro.components.operations import DistanceComparator
 from datumaro.components.project import Dataset
-from datumaro.components.extractor import (DatasetItem,
-    AnnotationType, Label, Mask, Points, Polygon,
-    PolyLine, Bbox, Caption,
-    LabelCategories, MaskCategories, PointsCategories
-)
 from datumaro.util.image import Image
 from datumaro.util.test_utils import TestDir
+
 from ..requirements import Requirements, mark_requirement
 
 
diff --git a/tests/cli/test_image_zip_format.py b/tests/cli/test_image_zip_format.py
index 2f7246ae07..07b742eadc 100644
--- a/tests/cli/test_image_zip_format.py
+++ b/tests/cli/test_image_zip_format.py
@@ -1,9 +1,10 @@
-import os
-import os.path as osp
 from unittest import TestCase
 from zipfile import ZipFile
+import os
+import os.path as osp
 
 import numpy as np
+
 from datumaro.cli.__main__ import main
 from datumaro.components.dataset import Dataset, DatasetItem
 from datumaro.util.test_utils import TestDir, compare_datasets
diff --git a/tests/cli/test_voc_format.py b/tests/cli/test_voc_format.py
index 079d4e6c98..08149f9934 100644
--- a/tests/cli/test_voc_format.py
+++ b/tests/cli/test_voc_format.py
@@ -1,13 +1,15 @@
-import os.path as osp
 from collections import OrderedDict
 from unittest import TestCase
+import os.path as osp
 
 import numpy as np
-import datumaro.plugins.voc_format.format as VOC
+
+from datumaro.cli.__main__ import main
 from datumaro.components.dataset import Dataset, DatasetItem
 from datumaro.components.extractor import Bbox, Label, Mask
-from datumaro.cli.__main__ import main
 from datumaro.util.test_utils import TestDir, compare_datasets
+import datumaro.plugins.voc_format.format as VOC
+
 from ..requirements import Requirements, mark_requirement
 
 DUMMY_DATASETS_DIR = osp.join(__file__[:__file__.rfind(osp.join('tests', ''))],
diff --git a/tests/cli/test_yolo_format.py b/tests/cli/test_yolo_format.py
index be7590dbb2..ebe28ce2f8 100644
--- a/tests/cli/test_yolo_format.py
+++ b/tests/cli/test_yolo_format.py
@@ -1,15 +1,17 @@
-import os.path as osp
 from unittest import TestCase
+import os.path as osp
 
 import numpy as np
+
 from datumaro.cli.__main__ import main
 from datumaro.components.dataset import Dataset
-from datumaro.components.extractor import (DatasetItem,
-    AnnotationType, Bbox)
+from datumaro.components.extractor import AnnotationType, Bbox, DatasetItem
 from datumaro.util.test_utils import TestDir, compare_datasets
 import datumaro.plugins.voc_format.format as VOC
+
 from ..requirements import Requirements, mark_requirement
 
+
 def run(test, *args, expected_code=0):
     test.assertEqual(expected_code, main(args), str(args))
 
diff --git a/tests/requirements.py b/tests/requirements.py
index 97e56e5577..d85f9a92a9 100644
--- a/tests/requirements.py
+++ b/tests/requirements.py
@@ -5,9 +5,9 @@
 import typing
 
 from attr import attrs
-
 import pytest
 
+
 class DatumaroComponent:
     Datumaro = "datumaro"
 
diff --git a/tests/test_RISE.py b/tests/test_RISE.py
index fd756f8087..0c31031c29 100644
--- a/tests/test_RISE.py
+++ b/tests/test_RISE.py
@@ -2,9 +2,11 @@
 from unittest import TestCase
 
 import numpy as np
-from datumaro.components.extractor import Label, Bbox
-from datumaro.components.launcher import Launcher
+
 from datumaro.components.algorithms.rise import RISE
+from datumaro.components.extractor import Bbox, Label
+from datumaro.components.launcher import Launcher
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_camvid_format.py b/tests/test_camvid_format.py
index 3951f8174a..05fc12630e 100644
--- a/tests/test_camvid_format.py
+++ b/tests/test_camvid_format.py
@@ -1,17 +1,21 @@
-import os.path as osp
 from collections import OrderedDict
 from functools import partial
 from unittest import TestCase
+import os.path as osp
 
 import numpy as np
-import datumaro.plugins.camvid_format as Camvid
-from datumaro.components.extractor import (AnnotationType, DatasetItem,
-    Extractor, LabelCategories, Mask)
+
 from datumaro.components.dataset import Dataset
+from datumaro.components.extractor import (
+    AnnotationType, DatasetItem, Extractor, LabelCategories, Mask,
+)
 from datumaro.plugins.camvid_format import CamvidConverter, CamvidImporter
 from datumaro.util.image import Image
-from datumaro.util.test_utils import (TestDir, compare_datasets,
-    test_save_and_load)
+from datumaro.util.test_utils import (
+    TestDir, compare_datasets, test_save_and_load,
+)
+import datumaro.plugins.camvid_format as Camvid
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_cifar_format.py b/tests/test_cifar_format.py
index 1983b1a875..9b38ac0f4d 100644
--- a/tests/test_cifar_format.py
+++ b/tests/test_cifar_format.py
@@ -1,13 +1,16 @@
-import os.path as osp
 from unittest import TestCase
+import os.path as osp
 
 import numpy as np
+
 from datumaro.components.dataset import Dataset
-from datumaro.components.extractor import (AnnotationType, DatasetItem, Label,
-    LabelCategories)
+from datumaro.components.extractor import (
+    AnnotationType, DatasetItem, Label, LabelCategories,
+)
 from datumaro.plugins.cifar_format import CifarConverter, CifarImporter
 from datumaro.util.image import Image
 from datumaro.util.test_utils import TestDir, compare_datasets
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_cityscapes_format.py b/tests/test_cityscapes_format.py
index 788e82d298..db3838d040 100644
--- a/tests/test_cityscapes_format.py
+++ b/tests/test_cityscapes_format.py
@@ -1,18 +1,23 @@
-import os.path as osp
 from collections import OrderedDict
 from functools import partial
 from unittest import TestCase
+import os.path as osp
 
 import numpy as np
-import datumaro.plugins.cityscapes_format as Cityscapes
-from datumaro.components.extractor import (AnnotationType, DatasetItem,
-    Extractor, LabelCategories, Mask)
+
 from datumaro.components.dataset import Dataset
-from datumaro.plugins.cityscapes_format import (CityscapesImporter,
-    CityscapesConverter)
+from datumaro.components.extractor import (
+    AnnotationType, DatasetItem, Extractor, LabelCategories, Mask,
+)
+from datumaro.plugins.cityscapes_format import (
+    CityscapesConverter, CityscapesImporter,
+)
 from datumaro.util.image import Image
-from datumaro.util.test_utils import (TestDir, compare_datasets,
-    test_save_and_load)
+from datumaro.util.test_utils import (
+    TestDir, compare_datasets, test_save_and_load,
+)
+import datumaro.plugins.cityscapes_format as Cityscapes
+
 from .requirements import Requirements, mark_requirement
 
 DUMMY_DATASET_DIR = osp.join(osp.dirname(__file__), 'assets',
diff --git a/tests/test_coco_format.py b/tests/test_coco_format.py
index d47514a2a4..fc6af9b024 100644
--- a/tests/test_coco_format.py
+++ b/tests/test_coco_format.py
@@ -1,33 +1,31 @@
 from functools import partial
 from itertools import product
+from unittest import TestCase
 import os
 import os.path as osp
-from unittest import TestCase
 
 import numpy as np
 
 from datumaro.components.dataset import Dataset
-from datumaro.components.extractor import (DatasetItem,
-    AnnotationType, Label, Mask, Points, Polygon, Bbox, Caption,
-    LabelCategories, PointsCategories
+from datumaro.components.extractor import (
+    AnnotationType, Bbox, Caption, DatasetItem, Label, LabelCategories, Mask,
+    Points, PointsCategories, Polygon,
 )
 from datumaro.plugins.coco_format.converter import (
-    CocoConverter,
-    CocoImageInfoConverter,
-    CocoCaptionsConverter,
-    CocoInstancesConverter,
-    CocoPersonKeypointsConverter,
-    CocoLabelsConverter,
-    CocoPanopticConverter,
-    CocoStuffConverter,
+    CocoCaptionsConverter, CocoConverter, CocoImageInfoConverter,
+    CocoInstancesConverter, CocoLabelsConverter, CocoPanopticConverter,
+    CocoPersonKeypointsConverter, CocoStuffConverter,
+)
+from datumaro.plugins.coco_format.importer import (
+    CocoCaptionsImporter, CocoImageInfoImporter, CocoImporter,
+    CocoInstancesImporter, CocoLabelsImporter, CocoPanopticImporter,
+    CocoPersonKeypointsImporter, CocoStuffImporter,
 )
-from datumaro.plugins.coco_format.importer import (CocoCaptionsImporter,
-    CocoImageInfoImporter, CocoImporter, CocoInstancesImporter,
-    CocoLabelsImporter, CocoPanopticImporter, CocoPersonKeypointsImporter,
-    CocoStuffImporter)
 from datumaro.util.image import Image
-from datumaro.util.test_utils import (TestDir, compare_datasets,
-    test_save_and_load)
+from datumaro.util.test_utils import (
+    TestDir, compare_datasets, test_save_and_load,
+)
+
 from .requirements import Requirements, mark_requirement
 
 DUMMY_DATASET_DIR = osp.join(osp.dirname(__file__), 'assets', 'coco_dataset')
diff --git a/tests/test_command_targets.py b/tests/test_command_targets.py
index e5e31059f0..81c7c2c374 100644
--- a/tests/test_command_targets.py
+++ b/tests/test_command_targets.py
@@ -1,12 +1,15 @@
-import os.path as osp
 from unittest import TestCase
+import os.path as osp
 
 import numpy as np
+
 from datumaro.components.project import Project
-from datumaro.util.command_targets import ProjectTarget, \
-    ImageTarget, SourceTarget
+from datumaro.util.command_targets import (
+    ImageTarget, ProjectTarget, SourceTarget,
+)
 from datumaro.util.image import save_image
 from datumaro.util.test_utils import TestDir
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_config.py b/tests/test_config.py
index 2fee6b2379..a62d55fca2 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -1,6 +1,7 @@
 from unittest import TestCase
 
 from datumaro.components.config import Config, DictConfig, SchemaBuilder
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_cvat_format.py b/tests/test_cvat_format.py
index cb02b4fde7..90b599f7c2 100644
--- a/tests/test_cvat_format.py
+++ b/tests/test_cvat_format.py
@@ -1,19 +1,22 @@
 from functools import partial
+from unittest import TestCase
 import os
 import os.path as osp
-from unittest import TestCase
 
 import numpy as np
-from datumaro.components.project import Dataset
-from datumaro.components.extractor import (DatasetItem,
-    AnnotationType, Points, Polygon, PolyLine, Bbox, Label,
-    LabelCategories,
+
+from datumaro.components.extractor import (
+    AnnotationType, Bbox, DatasetItem, Label, LabelCategories, Points, Polygon,
+    PolyLine,
 )
-from datumaro.plugins.cvat_format.extractor import CvatImporter
+from datumaro.components.project import Dataset
 from datumaro.plugins.cvat_format.converter import CvatConverter
+from datumaro.plugins.cvat_format.extractor import CvatImporter
 from datumaro.util.image import Image
-from datumaro.util.test_utils import (TestDir, compare_datasets,
-    test_save_and_load)
+from datumaro.util.test_utils import (
+    TestDir, compare_datasets, test_save_and_load,
+)
+
 from .requirements import Requirements, mark_requirement
 
 DUMMY_IMAGE_DATASET_DIR = osp.join(osp.dirname(__file__),
diff --git a/tests/test_dataset.py b/tests/test_dataset.py
index 67edf90ef1..d141d00d88 100644
--- a/tests/test_dataset.py
+++ b/tests/test_dataset.py
@@ -1,17 +1,22 @@
+from unittest import TestCase
 import os
 import os.path as osp
-from unittest import TestCase
 
 import numpy as np
+
+from datumaro.components.dataset import (
+    DEFAULT_FORMAT, Dataset, ItemStatus, eager_mode,
+)
 from datumaro.components.dataset_filter import (
-    XPathDatasetFilter, XPathAnnotationsFilter, DatasetItemEncoder)
-from datumaro.components.dataset import (Dataset, DEFAULT_FORMAT, ItemStatus,
-    eager_mode)
+    DatasetItemEncoder, XPathAnnotationsFilter, XPathDatasetFilter,
+)
 from datumaro.components.environment import Environment
 from datumaro.components.errors import DatumaroError, RepeatedItemError
-from datumaro.components.extractor import (DEFAULT_SUBSET_NAME, Extractor,
-    DatasetItem, ItemTransform, Label, Mask, Points, Polygon, PolyLine, Bbox, Caption,
-    LabelCategories, AnnotationType, Transform)
+from datumaro.components.extractor import (
+    DEFAULT_SUBSET_NAME, AnnotationType, Bbox, Caption, DatasetItem, Extractor,
+    ItemTransform, Label, LabelCategories, Mask, Points, Polygon, PolyLine,
+    Transform,
+)
 from datumaro.components.launcher import Launcher
 from datumaro.util.image import Image
 from datumaro.util.test_utils import TestDir, compare_datasets
diff --git a/tests/test_datumaro_format.py b/tests/test_datumaro_format.py
index cb4c74e43c..b4318fe2f3 100644
--- a/tests/test_datumaro_format.py
+++ b/tests/test_datumaro_format.py
@@ -1,21 +1,23 @@
 from functools import partial
+from unittest import TestCase
 import os
 import os.path as osp
-from unittest import TestCase
 
 import numpy as np
-from datumaro.components.project import Dataset
-from datumaro.components.extractor import (DatasetItem,
-    AnnotationType, Label, Mask, Points, Polygon,
-    PolyLine, Bbox, Caption,
-    LabelCategories, MaskCategories, PointsCategories
+
+from datumaro.components.extractor import (
+    AnnotationType, Bbox, Caption, DatasetItem, Label, LabelCategories, Mask,
+    MaskCategories, Points, PointsCategories, Polygon, PolyLine,
 )
-from datumaro.plugins.datumaro_format.extractor import DatumaroImporter
+from datumaro.components.project import Dataset
 from datumaro.plugins.datumaro_format.converter import DatumaroConverter
-from datumaro.util.mask_tools import generate_colormap
+from datumaro.plugins.datumaro_format.extractor import DatumaroImporter
 from datumaro.util.image import Image
-from datumaro.util.test_utils import (TestDir, compare_datasets_strict,
-    test_save_and_load)
+from datumaro.util.mask_tools import generate_colormap
+from datumaro.util.test_utils import (
+    TestDir, compare_datasets_strict, test_save_and_load,
+)
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_diff.py b/tests/test_diff.py
index 863f2a6faf..51f8aa32f9 100644
--- a/tests/test_diff.py
+++ b/tests/test_diff.py
@@ -1,10 +1,12 @@
 from unittest import TestCase
 
 import numpy as np
-from datumaro.components.extractor import (DatasetItem, Label, Bbox,
-    Caption, Mask, Points, DEFAULT_SUBSET_NAME)
-from datumaro.components.project import Dataset
+
+from datumaro.components.extractor import (
+    DEFAULT_SUBSET_NAME, Bbox, Caption, DatasetItem, Label, Mask, Points,
+)
 from datumaro.components.operations import DistanceComparator, ExactComparator
+from datumaro.components.project import Dataset
 
 from .requirements import Requirements, mark_requirement
 
diff --git a/tests/test_icdar_format.py b/tests/test_icdar_format.py
index 21bd8f0e0f..50a4051077 100644
--- a/tests/test_icdar_format.py
+++ b/tests/test_icdar_format.py
@@ -1,21 +1,26 @@
-import os.path as osp
 from functools import partial
 from unittest import TestCase
+import os.path as osp
 
 import numpy as np
 
-from datumaro.components.extractor import (Bbox, Caption, DatasetItem, Mask,
-    Polygon)
+from datumaro.components.extractor import (
+    Bbox, Caption, DatasetItem, Mask, Polygon,
+)
 from datumaro.components.project import Dataset
 from datumaro.plugins.icdar_format.converter import (
     IcdarTextLocalizationConverter, IcdarTextSegmentationConverter,
-    IcdarWordRecognitionConverter)
+    IcdarWordRecognitionConverter,
+)
 from datumaro.plugins.icdar_format.extractor import (
-    IcdarWordRecognitionImporter, IcdarTextLocalizationImporter,
-    IcdarTextSegmentationImporter)
+    IcdarTextLocalizationImporter, IcdarTextSegmentationImporter,
+    IcdarWordRecognitionImporter,
+)
 from datumaro.util.image import Image
-from datumaro.util.test_utils import (TestDir, compare_datasets,
-    test_save_and_load)
+from datumaro.util.test_utils import (
+    TestDir, compare_datasets, test_save_and_load,
+)
+
 from .requirements import Requirements, mark_requirement
 
 DUMMY_DATASET_DIR = osp.join(osp.dirname(__file__), 'assets', 'icdar_dataset')
diff --git a/tests/test_image.py b/tests/test_image.py
index 75bad6a8c3..7c18bec231 100644
--- a/tests/test_image.py
+++ b/tests/test_image.py
@@ -1,10 +1,12 @@
 from itertools import product
-import os.path as osp
 from unittest import TestCase
+import os.path as osp
 
 import numpy as np
-import datumaro.util.image as image_module
+
 from datumaro.util.test_utils import TestDir
+import datumaro.util.image as image_module
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_image_dir_format.py b/tests/test_image_dir_format.py
index dfc1a44d1a..cc4e04b377 100644
--- a/tests/test_image_dir_format.py
+++ b/tests/test_image_dir_format.py
@@ -1,13 +1,17 @@
+from unittest import TestCase
 import os
 import os.path as osp
-from unittest import TestCase
 
 import numpy as np
-from datumaro.components.project import Dataset
+
 from datumaro.components.extractor import DatasetItem
+from datumaro.components.project import Dataset
 from datumaro.plugins.image_dir_format import ImageDirConverter
 from datumaro.util.image import Image, save_image
-from datumaro.util.test_utils import TestDir, compare_datasets, test_save_and_load
+from datumaro.util.test_utils import (
+    TestDir, compare_datasets, test_save_and_load,
+)
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_image_zip_format.py b/tests/test_image_zip_format.py
index a0e5b5cf36..2970dfc65d 100644
--- a/tests/test_image_zip_format.py
+++ b/tests/test_image_zip_format.py
@@ -1,10 +1,11 @@
-import os.path as osp
 from unittest import TestCase
+import os.path as osp
 
 import numpy as np
+
 from datumaro.components.extractor import DatasetItem
 from datumaro.components.project import Dataset
-from datumaro.plugins.image_zip_format import ImageZipPath, ImageZipConverter
+from datumaro.plugins.image_zip_format import ImageZipConverter, ImageZipPath
 from datumaro.util.image import Image, save_image
 from datumaro.util.test_utils import TestDir, compare_datasets
 
diff --git a/tests/test_imagenet_format.py b/tests/test_imagenet_format.py
index b993f44d73..f8e009f44f 100644
--- a/tests/test_imagenet_format.py
+++ b/tests/test_imagenet_format.py
@@ -1,14 +1,16 @@
-import os.path as osp
 from unittest import TestCase
+import os.path as osp
 
 import numpy as np
+
 from datumaro.components.dataset import Dataset
-from datumaro.components.extractor import (DatasetItem, Label,
-    LabelCategories, AnnotationType
+from datumaro.components.extractor import (
+    AnnotationType, DatasetItem, Label, LabelCategories,
 )
 from datumaro.plugins.imagenet_format import ImagenetConverter, ImagenetImporter
 from datumaro.util.image import Image
 from datumaro.util.test_utils import TestDir, compare_datasets
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_imagenet_txt_format.py b/tests/test_imagenet_txt_format.py
index b7637f991a..637bd132b1 100644
--- a/tests/test_imagenet_txt_format.py
+++ b/tests/test_imagenet_txt_format.py
@@ -1,15 +1,18 @@
-import os.path as osp
 from unittest import TestCase
+import os.path as osp
 
 import numpy as np
+
 from datumaro.components.dataset import Dataset
-from datumaro.components.extractor import (DatasetItem, Label,
-    LabelCategories, AnnotationType
+from datumaro.components.extractor import (
+    AnnotationType, DatasetItem, Label, LabelCategories,
+)
+from datumaro.plugins.imagenet_txt_format import (
+    ImagenetTxtConverter, ImagenetTxtImporter,
 )
-from datumaro.plugins.imagenet_txt_format import \
-    ImagenetTxtConverter, ImagenetTxtImporter
 from datumaro.util.image import Image
 from datumaro.util.test_utils import TestDir, compare_datasets
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_images.py b/tests/test_images.py
index 6bff96cbe1..1840c2b127 100644
--- a/tests/test_images.py
+++ b/tests/test_images.py
@@ -1,11 +1,14 @@
-import os.path as osp
 from unittest import TestCase
+import os.path as osp
 
 import numpy as np
-from datumaro.util.test_utils import TestDir
-from datumaro.util.image import (lazy_image, load_image, save_image, \
-    Image, ByteImage, encode_image)
+
+from datumaro.util.image import (
+    ByteImage, Image, encode_image, lazy_image, load_image, save_image,
+)
 from datumaro.util.image_cache import ImageCache
+from datumaro.util.test_utils import TestDir
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_kitti_format.py b/tests/test_kitti_format.py
index e300cdc219..ac0328c8b0 100644
--- a/tests/test_kitti_format.py
+++ b/tests/test_kitti_format.py
@@ -1,25 +1,26 @@
-import os.path as osp
 from collections import OrderedDict
 from functools import partial
 from unittest import TestCase
+import os.path as osp
 
 import numpy as np
 
-from datumaro.components.extractor import (AnnotationType, Bbox, DatasetItem,
-    Extractor, LabelCategories, Mask)
 from datumaro.components.dataset import Dataset
-from datumaro.plugins.kitti_format.converter import (
-    KittiConverter,
+from datumaro.components.extractor import (
+    AnnotationType, Bbox, DatasetItem, Extractor, LabelCategories, Mask,
 )
-from datumaro.plugins.kitti_format.format import (KittiPath, KittiTask,
-    make_kitti_categories, make_kitti_detection_categories,
-    KittiLabelMap, parse_label_map, write_label_map,
+from datumaro.plugins.kitti_format.converter import KittiConverter
+from datumaro.plugins.kitti_format.format import (
+    KittiLabelMap, KittiPath, KittiTask, make_kitti_categories,
+    make_kitti_detection_categories, parse_label_map, write_label_map,
+)
+from datumaro.plugins.kitti_format.importer import (
+    KittiDetectionImporter, KittiImporter, KittiSegmentationImporter,
 )
-from datumaro.plugins.kitti_format.importer import (KittiImporter,
-    KittiDetectionImporter, KittiSegmentationImporter)
 from datumaro.util.image import Image
-from datumaro.util.test_utils import (TestDir, compare_datasets,
-    test_save_and_load)
+from datumaro.util.test_utils import (
+    TestDir, compare_datasets, test_save_and_load,
+)
 
 from .requirements import Requirements, mark_requirement
 
diff --git a/tests/test_labelme_format.py b/tests/test_labelme_format.py
index 35faf9de16..be89add706 100644
--- a/tests/test_labelme_format.py
+++ b/tests/test_labelme_format.py
@@ -1,15 +1,18 @@
 from functools import partial
+from unittest import TestCase
 import os
 import os.path as osp
-from unittest import TestCase
 
 import numpy as np
+
 from datumaro.components.dataset import Dataset
-from datumaro.components.extractor import (DatasetItem, Bbox, Mask, Polygon)
-from datumaro.plugins.labelme_format import LabelMeImporter, LabelMeConverter
+from datumaro.components.extractor import Bbox, DatasetItem, Mask, Polygon
+from datumaro.plugins.labelme_format import LabelMeConverter, LabelMeImporter
 from datumaro.util.image import Image
-from datumaro.util.test_utils import (TestDir, compare_datasets,
-    test_save_and_load)
+from datumaro.util.test_utils import (
+    TestDir, compare_datasets, test_save_and_load,
+)
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_lfw_format.py b/tests/test_lfw_format.py
index 64a37731a7..b1c445f1fa 100644
--- a/tests/test_lfw_format.py
+++ b/tests/test_lfw_format.py
@@ -1,12 +1,14 @@
-import os.path as osp
 from unittest import TestCase
+import os.path as osp
 
 import numpy as np
+
 from datumaro.components.dataset import Dataset
 from datumaro.components.extractor import DatasetItem, Label, Points
 from datumaro.plugins.lfw_format import LfwConverter, LfwImporter
 from datumaro.util.image import Image
 from datumaro.util.test_utils import TestDir, compare_datasets
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_market1501_format.py b/tests/test_market1501_format.py
index 17fc3afeac..26f6adf714 100644
--- a/tests/test_market1501_format.py
+++ b/tests/test_market1501_format.py
@@ -1,13 +1,16 @@
-import os.path as osp
 from unittest import TestCase
+import os.path as osp
 
 import numpy as np
+
 from datumaro.components.dataset import Dataset
 from datumaro.components.extractor import DatasetItem
-from datumaro.plugins.market1501_format import (Market1501Converter,
-    Market1501Importer)
+from datumaro.plugins.market1501_format import (
+    Market1501Converter, Market1501Importer,
+)
 from datumaro.util.image import Image
 from datumaro.util.test_utils import TestDir, compare_datasets
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_masks.py b/tests/test_masks.py
index d17e6a2c18..5e2950b517 100644
--- a/tests/test_masks.py
+++ b/tests/test_masks.py
@@ -1,8 +1,10 @@
 from unittest import TestCase
 
 import numpy as np
-import datumaro.util.mask_tools as mask_tools
+
 from datumaro.components.extractor import CompiledMask
+import datumaro.util.mask_tools as mask_tools
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_mnist_csv_format.py b/tests/test_mnist_csv_format.py
index 8fd258a8e5..b8ee635d30 100644
--- a/tests/test_mnist_csv_format.py
+++ b/tests/test_mnist_csv_format.py
@@ -1,14 +1,18 @@
-import os.path as osp
 from unittest import TestCase
+import os.path as osp
 
 import numpy as np
+
 from datumaro.components.dataset import Dataset
-from datumaro.components.extractor import (AnnotationType, DatasetItem, Label,
-    LabelCategories)
-from datumaro.plugins.mnist_csv_format import (MnistCsvConverter,
-    MnistCsvImporter)
+from datumaro.components.extractor import (
+    AnnotationType, DatasetItem, Label, LabelCategories,
+)
+from datumaro.plugins.mnist_csv_format import (
+    MnistCsvConverter, MnistCsvImporter,
+)
 from datumaro.util.image import Image
 from datumaro.util.test_utils import TestDir, compare_datasets
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_mnist_format.py b/tests/test_mnist_format.py
index 41fe67286f..f3f219b42f 100644
--- a/tests/test_mnist_format.py
+++ b/tests/test_mnist_format.py
@@ -1,13 +1,16 @@
-import os.path as osp
 from unittest import TestCase
+import os.path as osp
 
 import numpy as np
+
 from datumaro.components.dataset import Dataset
-from datumaro.components.extractor import (AnnotationType, DatasetItem, Label,
-    LabelCategories)
+from datumaro.components.extractor import (
+    AnnotationType, DatasetItem, Label, LabelCategories,
+)
 from datumaro.plugins.mnist_format import MnistConverter, MnistImporter
 from datumaro.util.image import Image
 from datumaro.util.test_utils import TestDir, compare_datasets
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_mot_format.py b/tests/test_mot_format.py
index 176269bc7d..d133fb7991 100644
--- a/tests/test_mot_format.py
+++ b/tests/test_mot_format.py
@@ -1,16 +1,19 @@
 from functools import partial
-import os.path as osp
 from unittest import TestCase
+import os.path as osp
 
 import numpy as np
+
 from datumaro.components.dataset import Dataset
-from datumaro.components.extractor import (DatasetItem,
-    AnnotationType, Bbox, LabelCategories
+from datumaro.components.extractor import (
+    AnnotationType, Bbox, DatasetItem, LabelCategories,
 )
 from datumaro.plugins.mot_format import MotSeqGtConverter, MotSeqImporter
 from datumaro.util.image import Image
-from datumaro.util.test_utils import (TestDir, compare_datasets,
-    test_save_and_load)
+from datumaro.util.test_utils import (
+    TestDir, compare_datasets, test_save_and_load,
+)
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_mots_format.py b/tests/test_mots_format.py
index 9ad633f098..eddd909a65 100644
--- a/tests/test_mots_format.py
+++ b/tests/test_mots_format.py
@@ -1,14 +1,17 @@
 from functools import partial
-import os.path as osp
 from unittest import TestCase
+import os.path as osp
 
 import numpy as np
-from datumaro.components.extractor import DatasetItem, Mask
+
 from datumaro.components.dataset import Dataset
-from datumaro.plugins.mots_format import MotsPngConverter, MotsImporter
+from datumaro.components.extractor import DatasetItem, Mask
+from datumaro.plugins.mots_format import MotsImporter, MotsPngConverter
 from datumaro.util.image import Image
-from datumaro.util.test_utils import (TestDir, compare_datasets,
-    test_save_and_load)
+from datumaro.util.test_utils import (
+    TestDir, compare_datasets, test_save_and_load,
+)
+
 from .requirements import Requirements, mark_requirement
 
 DUMMY_DATASET_DIR = osp.join(osp.dirname(__file__), 'assets', 'mots_dataset')
diff --git a/tests/test_ndr.py b/tests/test_ndr.py
index 7180d1f523..731bf238d9 100644
--- a/tests/test_ndr.py
+++ b/tests/test_ndr.py
@@ -2,11 +2,12 @@
 
 import numpy as np
 
+from datumaro.components.extractor import (
+    AnnotationType, DatasetItem, Label, LabelCategories,
+)
 from datumaro.components.project import Dataset
-from datumaro.components.extractor import (DatasetItem, Label,
-    LabelCategories, AnnotationType)
-
 import datumaro.plugins.ndr as ndr
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_open_images_format.py b/tests/test_open_images_format.py
index 9ba5b9a9d8..c49a804ca2 100644
--- a/tests/test_open_images_format.py
+++ b/tests/test_open_images_format.py
@@ -2,20 +2,24 @@
 #
 # SPDX-License-Identifier: MIT
 
-import os.path as osp
-
 from unittest.case import TestCase
+import os.path as osp
 
 import numpy as np
 
 from datumaro.components.dataset import Dataset
-from datumaro.components.extractor import AnnotationType, DatasetItem, Label, LabelCategories
-from datumaro.plugins.open_images_format import OpenImagesConverter, OpenImagesImporter
+from datumaro.components.extractor import (
+    AnnotationType, DatasetItem, Label, LabelCategories,
+)
+from datumaro.plugins.open_images_format import (
+    OpenImagesConverter, OpenImagesImporter,
+)
 from datumaro.util.image import Image
 from datumaro.util.test_utils import TestDir, compare_datasets
 
 from tests.requirements import Requirements, mark_requirement
 
+
 class OpenImagesFormatTest(TestCase):
     @mark_requirement(Requirements.DATUM_274)
     def test_can_save_and_load(self):
diff --git a/tests/test_ops.py b/tests/test_ops.py
index 8658015dc8..d068c1719f 100644
--- a/tests/test_ops.py
+++ b/tests/test_ops.py
@@ -2,14 +2,19 @@
 
 import numpy as np
 
-from datumaro.components.extractor import (Bbox, Caption, DatasetItem,
-    Label, Mask, Points, Polygon, PolyLine, DEFAULT_SUBSET_NAME,
-    LabelCategories, PointsCategories, MaskCategories, AnnotationType)
-from datumaro.components.operations import (FailedAttrVotingError,
-    IntersectMerge, NoMatchingAnnError, NoMatchingItemError, WrongGroupError,
-    compute_ann_statistics, mean_std, find_unique_images)
 from datumaro.components.dataset import Dataset
+from datumaro.components.extractor import (
+    DEFAULT_SUBSET_NAME, AnnotationType, Bbox, Caption, DatasetItem, Label,
+    LabelCategories, Mask, MaskCategories, Points, PointsCategories, Polygon,
+    PolyLine,
+)
+from datumaro.components.operations import (
+    FailedAttrVotingError, IntersectMerge, NoMatchingAnnError,
+    NoMatchingItemError, WrongGroupError, compute_ann_statistics,
+    find_unique_images, mean_std,
+)
 from datumaro.util.test_utils import compare_datasets
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_project.py b/tests/test_project.py
index 586800745f..29faf40909 100644
--- a/tests/test_project.py
+++ b/tests/test_project.py
@@ -1,16 +1,19 @@
+from unittest import TestCase
 import os
 import os.path as osp
-from unittest import TestCase
 
 import numpy as np
-from datumaro.components.project import Project, Environment
-from datumaro.components.config_model import Source, Model
-from datumaro.components.launcher import Launcher, ModelTransform
-from datumaro.components.extractor import (Extractor, DatasetItem,
-    Label, LabelCategories, AnnotationType)
+
 from datumaro.components.config import Config
-from datumaro.components.dataset import Dataset, DEFAULT_FORMAT
+from datumaro.components.config_model import Model, Source
+from datumaro.components.dataset import DEFAULT_FORMAT, Dataset
+from datumaro.components.extractor import (
+    AnnotationType, DatasetItem, Extractor, Label, LabelCategories,
+)
+from datumaro.components.launcher import Launcher, ModelTransform
+from datumaro.components.project import Environment, Project
 from datumaro.util.test_utils import TestDir, compare_datasets
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_sampler.py b/tests/test_sampler.py
index 0a587a7c67..2378fcfa5a 100644
--- a/tests/test_sampler.py
+++ b/tests/test_sampler.py
@@ -2,19 +2,18 @@
 from unittest import TestCase, skipIf
 import csv
 
-from datumaro.components.project import Dataset
 from datumaro.components.extractor import (
-    DatasetItem,
-    Label,
-    LabelCategories,
-    AnnotationType,
+    AnnotationType, DatasetItem, Label, LabelCategories,
 )
+from datumaro.components.project import Dataset
 from datumaro.util.image import Image
 
 try:
     import pandas as pd
+
+    from datumaro.plugins.sampler.algorithm.entropy import \
+        SampleEntropy as entropy
     from datumaro.plugins.sampler.sampler import Sampler
-    from datumaro.plugins.sampler.algorithm.entropy import SampleEntropy as entropy
     has_libs = True
 except ImportError:
     has_libs = False
diff --git a/tests/test_splitter.py b/tests/test_splitter.py
index a1d7888714..82ac0851d3 100644
--- a/tests/test_splitter.py
+++ b/tests/test_splitter.py
@@ -1,19 +1,14 @@
 from unittest import TestCase
 
 import numpy as np
-from datumaro.components.project import Dataset
+
 from datumaro.components.extractor import (
-    DatasetItem,
-    Label,
-    Bbox,
-    Mask,
-    Polygon,
-    LabelCategories,
-    AnnotationType,
+    AnnotationType, Bbox, DatasetItem, Label, LabelCategories, Mask, Polygon,
 )
-
-import datumaro.plugins.splitter as splitter
 from datumaro.components.operations import compute_ann_statistics
+from datumaro.components.project import Dataset
+import datumaro.plugins.splitter as splitter
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_tfrecord_format.py b/tests/test_tfrecord_format.py
index 8b3d499cad..2a54e855e6 100644
--- a/tests/test_tfrecord_format.py
+++ b/tests/test_tfrecord_format.py
@@ -1,24 +1,29 @@
 from functools import partial
+from unittest import TestCase, skipIf
 import os
 import os.path as osp
-from unittest import TestCase, skipIf
 
 import numpy as np
+
 from datumaro.components.dataset import Dataset
-from datumaro.components.extractor import (DatasetItem,
-    AnnotationType, Bbox, Mask, LabelCategories
+from datumaro.components.extractor import (
+    AnnotationType, Bbox, DatasetItem, LabelCategories, Mask,
+)
+from datumaro.util.image import ByteImage, Image, encode_image
+from datumaro.util.test_utils import (
+    TestDir, compare_datasets, test_save_and_load,
 )
-from datumaro.util.image import Image, ByteImage, encode_image
-from datumaro.util.test_utils import (TestDir, compare_datasets,
-    test_save_and_load)
 from datumaro.util.tf_util import check_import
+
 from .requirements import Requirements, mark_requirement
 
 try:
-    from datumaro.plugins.tf_detection_api_format.extractor import \
-        TfDetectionApiExtractor, TfDetectionApiImporter
-    from datumaro.plugins.tf_detection_api_format.converter import \
-        TfDetectionApiConverter
+    from datumaro.plugins.tf_detection_api_format.converter import (
+        TfDetectionApiConverter,
+    )
+    from datumaro.plugins.tf_detection_api_format.extractor import (
+        TfDetectionApiExtractor, TfDetectionApiImporter,
+    )
     import_failed = False
 except ImportError:
     import_failed = True
diff --git a/tests/test_transforms.py b/tests/test_transforms.py
index bf2da9000a..ea5748bd5a 100644
--- a/tests/test_transforms.py
+++ b/tests/test_transforms.py
@@ -1,15 +1,17 @@
-import logging as log
 from unittest import TestCase
+import logging as log
 
 import numpy as np
-from datumaro.components.project import Dataset
-from datumaro.components.extractor import (DatasetItem,
-    Mask, Polygon, PolyLine, Points, Bbox, Label,
-    LabelCategories, MaskCategories, AnnotationType
+
+from datumaro.components.extractor import (
+    AnnotationType, Bbox, DatasetItem, Label, LabelCategories, Mask,
+    MaskCategories, Points, Polygon, PolyLine,
 )
-import datumaro.util.mask_tools as mask_tools
-import datumaro.plugins.transforms as transforms
+from datumaro.components.project import Dataset
 from datumaro.util.test_utils import compare_datasets
+import datumaro.plugins.transforms as transforms
+import datumaro.util.mask_tools as mask_tools
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_util.py b/tests/test_util.py
index 53601e4228..c5048334de 100644
--- a/tests/test_util.py
+++ b/tests/test_util.py
@@ -1,11 +1,11 @@
+from unittest import TestCase
 import os
 import os.path as osp
 
-from unittest import TestCase
-
 from datumaro.util import Rollback, error_rollback
-from datumaro.util.test_utils import TestDir
 from datumaro.util.os_util import walk
+from datumaro.util.test_utils import TestDir
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_validator.py b/tests/test_validator.py
index 22d47795ef..0e30a3a78e 100644
--- a/tests/test_validator.py
+++ b/tests/test_validator.py
@@ -8,18 +8,21 @@
 import numpy as np
 
 from datumaro.components.dataset import Dataset, DatasetItem
-from datumaro.components.errors import (MissingLabelCategories,
-    MissingAnnotation, MultiLabelAnnotations, MissingAttribute,
-    UndefinedLabel, UndefinedAttribute, LabelDefinedButNotFound,
-    AttributeDefinedButNotFound, OnlyOneLabel, FewSamplesInLabel,
-    FewSamplesInAttribute, ImbalancedLabels, ImbalancedAttribute,
-    ImbalancedDistInLabel, ImbalancedDistInAttribute,
-    NegativeLength, InvalidValue, FarFromLabelMean,
-    FarFromAttrMean, OnlyOneAttributeValue)
+from datumaro.components.errors import (
+    AttributeDefinedButNotFound, FarFromAttrMean, FarFromLabelMean,
+    FewSamplesInAttribute, FewSamplesInLabel, ImbalancedAttribute,
+    ImbalancedDistInAttribute, ImbalancedDistInLabel, ImbalancedLabels,
+    InvalidValue, LabelDefinedButNotFound, MissingAnnotation, MissingAttribute,
+    MissingLabelCategories, MultiLabelAnnotations, NegativeLength,
+    OnlyOneAttributeValue, OnlyOneLabel, UndefinedAttribute, UndefinedLabel,
+)
 from datumaro.components.extractor import Bbox, Label, Mask, Polygon
 from datumaro.components.validator import TaskType
-from datumaro.plugins.validators import (_TaskValidator,
-    ClassificationValidator, DetectionValidator, SegmentationValidator)
+from datumaro.plugins.validators import (
+    ClassificationValidator, DetectionValidator, SegmentationValidator,
+    _TaskValidator,
+)
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_vgg_face2_format.py b/tests/test_vgg_face2_format.py
index 9801f44d17..a8b584782e 100644
--- a/tests/test_vgg_face2_format.py
+++ b/tests/test_vgg_face2_format.py
@@ -1,14 +1,18 @@
-import os.path as osp
 from unittest import TestCase
+import os.path as osp
 
 import numpy as np
+
 from datumaro.components.dataset import Dataset
-from datumaro.components.extractor import (AnnotationType, Bbox, DatasetItem,
-    Label, LabelCategories, Points)
-from datumaro.plugins.vgg_face2_format import (VggFace2Converter,
-    VggFace2Importer)
+from datumaro.components.extractor import (
+    AnnotationType, Bbox, DatasetItem, Label, LabelCategories, Points,
+)
+from datumaro.plugins.vgg_face2_format import (
+    VggFace2Converter, VggFace2Importer,
+)
 from datumaro.util.image import Image
 from datumaro.util.test_utils import TestDir, compare_datasets
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_voc_format.py b/tests/test_voc_format.py
index fadc6a4061..269e3def3b 100644
--- a/tests/test_voc_format.py
+++ b/tests/test_voc_format.py
@@ -6,26 +6,26 @@
 
 import numpy as np
 
-from datumaro.components.extractor import (Extractor, DatasetItem,
-    AnnotationType, Label, Bbox, Mask, LabelCategories, MaskCategories,
+from datumaro.components.dataset import Dataset
+from datumaro.components.extractor import (
+    AnnotationType, Bbox, DatasetItem, Extractor, Label, LabelCategories, Mask,
+    MaskCategories,
 )
-import datumaro.plugins.voc_format.format as VOC
 from datumaro.plugins.voc_format.converter import (
-    VocConverter,
-    VocClassificationConverter,
-    VocDetectionConverter,
-    VocLayoutConverter,
-    VocActionConverter,
-    VocSegmentationConverter,
+    VocActionConverter, VocClassificationConverter, VocConverter,
+    VocDetectionConverter, VocLayoutConverter, VocSegmentationConverter,
+)
+from datumaro.plugins.voc_format.importer import (
+    VocActionImporter, VocClassificationImporter, VocDetectionImporter,
+    VocImporter, VocLayoutImporter, VocSegmentationImporter,
 )
-from datumaro.plugins.voc_format.importer import (VocActionImporter,
-    VocClassificationImporter, VocDetectionImporter, VocImporter,
-    VocLayoutImporter, VocSegmentationImporter)
-from datumaro.components.dataset import Dataset
 from datumaro.util.image import Image
 from datumaro.util.mask_tools import load_mask
-from datumaro.util.test_utils import (TestDir, compare_datasets,
-    test_save_and_load)
+from datumaro.util.test_utils import (
+    TestDir, compare_datasets, test_save_and_load,
+)
+import datumaro.plugins.voc_format.format as VOC
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_widerface_format.py b/tests/test_widerface_format.py
index b25f987802..79996aa1c3 100644
--- a/tests/test_widerface_format.py
+++ b/tests/test_widerface_format.py
@@ -1,12 +1,16 @@
-import os.path as osp
 from unittest import TestCase
+import os.path as osp
 
 import numpy as np
-from datumaro.components.extractor import (Bbox, DatasetItem, Label)
+
 from datumaro.components.dataset import Dataset
-from datumaro.plugins.widerface_format import WiderFaceConverter, WiderFaceImporter
+from datumaro.components.extractor import Bbox, DatasetItem, Label
+from datumaro.plugins.widerface_format import (
+    WiderFaceConverter, WiderFaceImporter,
+)
 from datumaro.util.image import Image
 from datumaro.util.test_utils import TestDir, compare_datasets
+
 from .requirements import Requirements, mark_requirement
 
 
diff --git a/tests/test_yolo_format.py b/tests/test_yolo_format.py
index cfb4191985..3b34a7d534 100644
--- a/tests/test_yolo_format.py
+++ b/tests/test_yolo_format.py
@@ -1,16 +1,18 @@
+from unittest import TestCase
 import os
 import os.path as osp
-from unittest import TestCase
 
 import numpy as np
-from datumaro.components.extractor import (DatasetItem,
-    AnnotationType, Bbox, LabelCategories,
-)
+
 from datumaro.components.dataset import Dataset
-from datumaro.plugins.yolo_format.extractor import YoloImporter
+from datumaro.components.extractor import (
+    AnnotationType, Bbox, DatasetItem, LabelCategories,
+)
 from datumaro.plugins.yolo_format.converter import YoloConverter
+from datumaro.plugins.yolo_format.extractor import YoloImporter
 from datumaro.util.image import Image, save_image
 from datumaro.util.test_utils import TestDir, compare_datasets
+
 from .requirements import Requirements, mark_requirement