Register torch's unresolvable import paths in cli module

CHANGELOG.md

@@ -244,6 +244,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Fixed issue where the CLI could not pass a `Profiler` to the `Trainer` ([#13084](https://github.com/PyTorchLightning/pytorch-lightning/pull/13084))
 
 
+- Fixed issue where the CLI fails with certain torch objects ([#13153](https://github.com/PyTorchLightning/pytorch-lightning/pull/13153))
+
+
 - Fixed logging's step values when multiple dataloaders are used during evaluation ([#12184](https://github.com/PyTorchLightning/pytorch-lightning/pull/12184))
 
 

pytorch_lightning/utilities/cli.py

@@ -34,14 +34,22 @@
 from pytorch_lightning.utilities.model_helpers import is_overridden
 from pytorch_lightning.utilities.rank_zero import _warn, rank_zero_deprecation, rank_zero_warn
 
-_JSONARGPARSE_SIGNATURES_AVAILABLE = _RequirementAvailable("jsonargparse[signatures]>=4.7.1")
+_JSONARGPARSE_SIGNATURES_AVAILABLE = _RequirementAvailable("jsonargparse[signatures]>=4.8.0")
 
 if _JSONARGPARSE_SIGNATURES_AVAILABLE:
     import docstring_parser
-    from jsonargparse import ActionConfigFile, ArgumentParser, class_from_function, Namespace, set_config_read_mode
+    from jsonargparse import (
+        ActionConfigFile,
+        ArgumentParser,
+        class_from_function,
+        Namespace,
+        register_unresolvable_import_paths,
+        set_config_read_mode,
+    )
     from jsonargparse.typehints import get_all_subclass_paths
     from jsonargparse.util import import_object
 
+    register_unresolvable_import_paths(torch)  # Required until fix https://github.com/pytorch/pytorch/issues/74483
     set_config_read_mode(fsspec_enabled=True)
 else:
     locals()["ArgumentParser"] = object

requirements/extra.txt

@@ -4,6 +4,6 @@ matplotlib>3.1, <3.5.3
 torchtext>=0.9.*, <=0.12.0
 omegaconf>=2.0.5, <=2.1.*
 hydra-core>=1.0.5, <=1.1.*
-jsonargparse[signatures]>=4.7.1, <4.7.4
+jsonargparse[signatures]>=4.8.0, <=4.8.0
 gcsfs>=2021.5.0, <=2022.2.0
 rich>=10.2.2,!=10.15.*, <=12.0.0

tests/utilities/test_cli.py

@@ -20,7 +20,7 @@
 from argparse import Namespace
 from contextlib import contextmanager, ExitStack, redirect_stdout
 from io import StringIO
-from typing import List, Optional, Union
+from typing import Callable, List, Optional, Union
 from unittest import mock
 from unittest.mock import ANY
 
@@ -1561,3 +1561,16 @@ def test_cli_auto_seeding():
         cli = LightningCLI(TestModel, run=False)
     assert cli.seed_everything_default is True
     assert cli.config["seed_everything"] == 123  # the original seed is kept
+
+
+def test_unresolvable_import_paths():
+    class TestModel(BoringModel):
+        def __init__(self, a_func: Callable = torch.softmax):
+            super().__init__()
+            self.a_func = a_func
+
+    out = StringIO()
+    with mock.patch("sys.argv", ["any.py", "--print_config"]), redirect_stdout(out), pytest.raises(SystemExit):
+        LightningCLI(TestModel, run=False)
+
+    assert "a_func: torch.softmax" in out.getvalue()