diff --git a/mmpose/datasets/pipelines/bottom_up_transform.py b/mmpose/datasets/pipelines/bottom_up_transform.py
index a019d64307..61783a427f 100644
--- a/mmpose/datasets/pipelines/bottom_up_transform.py
+++ b/mmpose/datasets/pipelines/bottom_up_transform.py
@@ -76,7 +76,7 @@ def _resize_align_multi_scale(image, input_size, current_scale, min_scale):
     return image_resized, center, scale
 
 
-class HeatmapGenerator():
+class HeatmapGenerator:
     """Generate heatmaps for bottom-up models.
 
     Args:
@@ -126,7 +126,7 @@ def __call__(self, joints):
         return hms
 
 
-class JointsEncoder():
+class JointsEncoder:
     """Encodes the visible joints into (coordinates, score); The coordinate of
     one joint and its score are of `int` type.
 
diff --git a/mmpose/datasets/pipelines/mesh_transform.py b/mmpose/datasets/pipelines/mesh_transform.py
index f17ab5ae40..509145018b 100644
--- a/mmpose/datasets/pipelines/mesh_transform.py
+++ b/mmpose/datasets/pipelines/mesh_transform.py
@@ -167,7 +167,7 @@ def _flip_joints_3d(joints_3d, joints_3d_visible, flip_pairs):
 
 
 @PIPELINES.register_module()
-class LoadIUVFromFile(object):
+class LoadIUVFromFile:
     """Loading IUV image from file."""
 
     def __init__(self, to_float32=False):
@@ -195,7 +195,7 @@ def __call__(self, results):
 
 
 @PIPELINES.register_module()
-class IUVToTensor():
+class IUVToTensor:
     """Transform IUV image to part index mask and uv coordinates image. The 3
     channels of IUV image means: part index, u coordinates, v coordinates.
 
@@ -222,7 +222,7 @@ def __call__(self, results):
 
 
 @PIPELINES.register_module()
-class MeshRandomChannelNoise():
+class MeshRandomChannelNoise:
     """Data augmentation with random channel noise.
 
     Required keys: 'img'
@@ -251,7 +251,7 @@ def __call__(self, results):
 
 
 @PIPELINES.register_module()
-class MeshRandomFlip():
+class MeshRandomFlip:
     """Data augmentation with random image flip.
 
     Required keys: 'img', 'joints_2d','joints_2d_visible', 'joints_3d',
@@ -307,7 +307,7 @@ def __call__(self, results):
 
 
 @PIPELINES.register_module()
-class MeshGetRandomScaleRotation():
+class MeshGetRandomScaleRotation:
     """Data augmentation with random scaling & rotating.
 
     Required key: 'scale'. Modifies key: 'scale' and 'rotation'.
@@ -343,7 +343,7 @@ def __call__(self, results):
 
 
 @PIPELINES.register_module()
-class MeshAffine():
+class MeshAffine:
     """Affine transform the image to get input image. Affine transform the 2D
     keypoints, 3D kepoints and IUV image too.
 
diff --git a/mmpose/datasets/pipelines/shared_transform.py b/mmpose/datasets/pipelines/shared_transform.py
index 91be1798f3..6d70ce3acf 100644
--- a/mmpose/datasets/pipelines/shared_transform.py
+++ b/mmpose/datasets/pipelines/shared_transform.py
@@ -8,7 +8,7 @@
 
 
 @PIPELINES.register_module()
-class ToTensor():
+class ToTensor:
     """Transform image to Tensor.
 
     Required key: 'img'. Modifies key: 'img'.
@@ -23,7 +23,7 @@ def __call__(self, results):
 
 
 @PIPELINES.register_module()
-class NormalizeTensor():
+class NormalizeTensor:
     """Normalize the Tensor image (CxHxW), with mean and std.
 
     Required key: 'img'. Modifies key: 'img'.
diff --git a/mmpose/datasets/pipelines/top_down_transform.py b/mmpose/datasets/pipelines/top_down_transform.py
index 2a1f678929..c95dd88179 100644
--- a/mmpose/datasets/pipelines/top_down_transform.py
+++ b/mmpose/datasets/pipelines/top_down_transform.py
@@ -7,7 +7,7 @@
 
 
 @PIPELINES.register_module()
-class TopDownRandomFlip():
+class TopDownRandomFlip:
     """Data augmentation with random image flip.
 
     Required keys: 'img', 'joints_3d', 'joints_3d_visible', 'center' and
@@ -46,7 +46,7 @@ def __call__(self, results):
 
 
 @PIPELINES.register_module()
-class TopDownHalfBodyTransform():
+class TopDownHalfBodyTransform:
     """Data augmentation with half-body transform. Keep only the upper body or
     the lower body at random.
 
@@ -126,7 +126,7 @@ def __call__(self, results):
 
 
 @PIPELINES.register_module()
-class TopDownGetRandomScaleRotation():
+class TopDownGetRandomScaleRotation:
     """Data augmentation with random scaling & rotating.
 
     Required key: 'scale'. Modifies key: 'scale' and 'rotation'.
@@ -162,7 +162,7 @@ def __call__(self, results):
 
 
 @PIPELINES.register_module()
-class TopDownAffine():
+class TopDownAffine:
     """Affine transform the image to make input.
 
     Required keys:'img', 'joints_3d', 'joints_3d_visible', 'ann_info','scale',
@@ -198,7 +198,7 @@ def __call__(self, results):
 
 
 @PIPELINES.register_module()
-class TopDownGenerateTarget():
+class TopDownGenerateTarget:
     """Generate the target heatmap.
 
     Required keys: 'joints_3d', 'joints_3d_visible', 'ann_info'.
diff --git a/tests/test_compose.py b/tests/test_compose.py
index f4c858f7f2..d7fcf3bd85 100644
--- a/tests/test_compose.py
+++ b/tests/test_compose.py
@@ -36,7 +36,7 @@ def test_compose():
     # test Compose when forward data is None
     results = None
 
-    class ExamplePipeline():
+    class ExamplePipeline:
 
         def __call__(self, results):
             return None