Fix use of jsonargparse avoiding reliance on non-public internal logic.

requirements/base.txt

@@ -8,7 +8,7 @@ torchmetrics >0.7.0, <0.11.0  # strict
 pytorch-lightning >1.8.0, <2.0.0  # strict
 pyDeprecate >0.2.0
 pandas >1.1.0, <=1.5.2
-jsonargparse[signatures] >4.0.0, <=4.9.0
+jsonargparse[signatures] >=4.22.0, <4.23.0
 click >=7.1.2, <=8.1.3
 protobuf <=3.20.1
 fsspec[http] >=2022.5.0,<=2023.6.0

src/flash/core/utilities/flash_cli.py

@@ -20,8 +20,7 @@
 from typing import Any, Callable, Dict, List, Optional, Set, Type, Union
 
 import pytorch_lightning as pl
-from jsonargparse import ArgumentParser
-from jsonargparse.signatures import get_class_signature_functions
+from jsonargparse import ArgumentParser, class_from_function
 from lightning_utilities.core.overrides import is_overridden
 from pytorch_lightning import LightningModule, Trainer
 
@@ -31,7 +30,6 @@
     LightningArgumentParser,
     LightningCLI,
     SaveConfigCallback,
-    class_from_function,
 )
 from flash.core.utilities.stability import beta
 
@@ -107,6 +105,16 @@ def wrapper(*args, **kwargs):
     return wrapper
 
 
+def get_class_signature_functions(classes):
+    signatures = []
+    for num, cls in enumerate(classes):
+        if cls.__new__ is not object.__new__ and not any(cls.__new__ is c.__new__ for c in classes[num + 1 :]):
+            signatures.append((cls, cls.__new__))
+        if not any(cls.__init__ is c.__init__ for c in classes[num + 1 :]):
+            signatures.append((cls, cls.__init__))
+    return signatures
+
+
 def get_overlapping_args(func_a, func_b) -> Set[str]:
     func_a = get_class_signature_functions([func_a])[0][1]
     func_b = get_class_signature_functions([func_b])[0][1]
@@ -214,7 +222,7 @@ def add_arguments_to_parser(self, parser) -> None:
     def add_subcommand_from_function(self, subcommands, function, function_name=None):
         subcommand = ArgumentParser()
         if get_kwarg_name(function) == "data_module_kwargs":
-            datamodule_function = class_from_function(function, return_type=self.local_datamodule_class)
+            datamodule_function = class_from_function(function, self.local_datamodule_class)
             subcommand.add_class_arguments(
                 datamodule_function,
                 fail_untyped=False,
@@ -233,7 +241,7 @@ def add_subcommand_from_function(self, subcommands, function, function_name=None
                 },
             )
         else:
-            datamodule_function = class_from_function(drop_kwargs(function), return_type=self.local_datamodule_class)
+            datamodule_function = class_from_function(drop_kwargs(function), self.local_datamodule_class)
             subcommand.add_class_arguments(datamodule_function, fail_untyped=False)
         subcommand_name = function_name or function.__name__
         subcommands.add_subcommand(subcommand_name, subcommand)

src/flash/core/utilities/lightning_cli.py

@@ -4,14 +4,11 @@
 import os
 import warnings
 from argparse import Namespace
-from functools import wraps
 from types import MethodType
 from typing import Any, Callable, Dict, List, Optional, Tuple, Type, Union, cast
 
 import torch
-from jsonargparse import ActionConfigFile, ArgumentParser, set_config_read_mode
-from jsonargparse.signatures import ClassFromFunctionBase
-from jsonargparse.typehints import ClassType
+from jsonargparse import ActionConfigFile, ArgumentParser, class_from_function, set_config_read_mode
 from pytorch_lightning import LightningDataModule, LightningModule, Trainer
 from pytorch_lightning.callbacks import Callback
 from pytorch_lightning.utilities.cloud_io import get_filesystem
@@ -25,46 +22,16 @@
 LRSchedulerType = Union[Type[torch.optim.lr_scheduler._LRScheduler], Type[torch.optim.lr_scheduler.ReduceLROnPlateau]]
 
 
-def class_from_function(
-    func: Callable[..., ClassType],
-    return_type: Optional[Type[ClassType]] = None,
-) -> Type[ClassType]:
-    """Creates a dynamic class which if instantiated is equivalent to calling func.
-
-    Args:
-        func: A function that returns an instance of a class. It must have a return type annotation.
-    """
-
-    @wraps(func)
-    def __new__(cls, *args, **kwargs):
-        return func(*args, **kwargs)
-
-    if return_type is None:
-        return_type = inspect.signature(func).return_annotation
-
-    if isinstance(return_type, str):
-        raise RuntimeError("Classmethod instantiation is not supported when the return type annotation is a string.")
-
-    class ClassFromFunction(return_type, ClassFromFunctionBase):  # type: ignore
-        pass
-
-    ClassFromFunction.__new__ = __new__  # type: ignore
-    ClassFromFunction.__doc__ = func.__doc__
-    ClassFromFunction.__name__ = func.__name__
-
-    return ClassFromFunction
-
-
 class LightningArgumentParser(ArgumentParser):
     """Extension of jsonargparse's ArgumentParser for pytorch-lightning."""
 
-    def __init__(self, *args: Any, parse_as_dict: bool = True, **kwargs: Any) -> None:
+    def __init__(self, *args: Any, **kwargs: Any) -> None:
         """Initialize argument parser that supports configuration file input.
 
         For full details of accepted arguments see
         `ArgumentParser.__init__ <https://jsonargparse.readthedocs.io/en/stable/#jsonargparse.core.ArgumentParser.__init__>`_.
         """
-        super().__init__(*args, parse_as_dict=parse_as_dict, **kwargs)
+        super().__init__(*args, **kwargs)
         self.add_argument(
             "--config", action=ActionConfigFile, help="Path to a configuration file in json or yaml format."
         )
@@ -95,7 +62,7 @@ def add_lightning_class_args(
 
         if inspect.isclass(lightning_class) and issubclass(
             cast(type, lightning_class),
-            (Trainer, LightningModule, LightningDataModule, Callback, ClassFromFunctionBase),
+            (Trainer, LightningModule, LightningDataModule, Callback),
         ):
             if issubclass(cast(type, lightning_class), Callback):
                 self.callback_keys.append(nested_key)

tests/core/utilities/test_lightning_cli.py

@@ -40,7 +40,7 @@ def test_default_args(mock_argparse, tmpdir):
     """Tests default argument parser for Trainer."""
     mock_argparse.return_value = Namespace(**Trainer.default_attributes())
 
-    parser = LightningArgumentParser(add_help=False, parse_as_dict=False)
+    parser = LightningArgumentParser(add_help=False)
     args = parser.parse_args([])
 
     args.max_epochs = 5
@@ -54,7 +54,7 @@ def test_default_args(mock_argparse, tmpdir):
 @pytest.mark.parametrize("cli_args", [["--accumulate_grad_batches=22"], ["--default_root_dir=./"], []])
 def test_add_argparse_args_redefined(cli_args):
     """Redefines some default Trainer arguments via the cli and tests the Trainer initialization correctness."""
-    parser = LightningArgumentParser(add_help=False, parse_as_dict=False)
+    parser = LightningArgumentParser(add_help=False)
     parser.add_lightning_class_args(Trainer, None)
 
     args = parser.parse_args(cli_args)
@@ -79,19 +79,19 @@ def test_add_argparse_args_redefined(cli_args):
         ("--auto_lr_find=True --auto_scale_batch_size=power", {"auto_lr_find": True, "auto_scale_batch_size": "power"}),
         (
             "--auto_lr_find any_string --auto_scale_batch_size ON",
-            {"auto_lr_find": "any_string", "auto_scale_batch_size": True},
+            {"auto_lr_find": "any_string", "auto_scale_batch_size": "ON"},
         ),
-        ("--auto_lr_find=Yes --auto_scale_batch_size=On", {"auto_lr_find": True, "auto_scale_batch_size": True}),
-        ("--auto_lr_find Off --auto_scale_batch_size No", {"auto_lr_find": False, "auto_scale_batch_size": False}),
-        ("--auto_lr_find TRUE --auto_scale_batch_size FALSE", {"auto_lr_find": True, "auto_scale_batch_size": False}),
+        ("--auto_lr_find=Yes --auto_scale_batch_size=On", {"auto_lr_find": True, "auto_scale_batch_size": "On"}),
+        ("--auto_lr_find Off --auto_scale_batch_size No", {"auto_lr_find": False, "auto_scale_batch_size": "No"}),
+        ("--auto_lr_find TRUE --auto_scale_batch_size FALSE", {"auto_lr_find": True, "auto_scale_batch_size": "FALSE"}),
         ("--limit_train_batches=100", {"limit_train_batches": 100}),
         ("--limit_train_batches 0.8", {"limit_train_batches": 0.8}),
     ],
 )
 def test_parse_args_parsing(cli_args, expected):
     """Test parsing simple types and None optionals not modified."""
     cli_args = cli_args.split(" ") if cli_args else []
-    parser = LightningArgumentParser(add_help=False, parse_as_dict=False)
+    parser = LightningArgumentParser(add_help=False)
     parser.add_lightning_class_args(Trainer, None)
     with patch("sys.argv", ["any.py"] + cli_args):
         args = parser.parse_args()
@@ -112,7 +112,7 @@ def test_parse_args_parsing(cli_args, expected):
 )
 def test_parse_args_parsing_complex_types(cli_args, expected, instantiate):
     """Test parsing complex types."""
-    parser = LightningArgumentParser(add_help=False, parse_as_dict=False)
+    parser = LightningArgumentParser(add_help=False)
     parser.add_lightning_class_args(Trainer, None)
     with patch("sys.argv", ["any.py"] + cli_args):
         args = parser.parse_args()
@@ -137,7 +137,7 @@ def test_parse_args_parsing_gpus(mocker, cli_args, expected_gpu):
     """Test parsing of gpus and instantiation of Trainer."""
     mocker.patch("lightning_lite.utilities.device_parser._get_all_available_gpus", return_value=[0, 1])
     cli_args = cli_args.split(" ") if cli_args else []
-    parser = LightningArgumentParser(add_help=False, parse_as_dict=False)
+    parser = LightningArgumentParser(add_help=False)
     parser.add_lightning_class_args(Trainer, None)
     with patch("sys.argv", ["any.py"] + cli_args):
         args = parser.parse_args()
@@ -310,8 +310,8 @@ def test_lightning_cli_args(tmpdir):
         config = yaml.safe_load(f.read())
     assert "model" not in config
     assert "model" not in cli.config
-    assert config["data"] == cli.config["data"]
-    assert config["trainer"] == cli.config["trainer"]
+    assert config["data"] == cli.config["data"].as_dict()
+    assert config["trainer"] == cli.config["trainer"].as_dict()
 
 
 @pytest.mark.skipif(not _TOPIC_CORE_AVAILABLE, reason="Not testing core.")
@@ -363,9 +363,9 @@ def test_lightning_cli_config_and_subclass_mode(tmpdir):
     assert os.path.isfile(config_path)
     with open(config_path) as f:
         config = yaml.safe_load(f.read())
-    assert config["model"] == cli.config["model"]
-    assert config["data"] == cli.config["data"]
-    assert config["trainer"] == cli.config["trainer"]
+    assert config["model"] == cli.config["model"].as_dict()
+    assert config["data"] == cli.config["data"].as_dict()
+    assert config["trainer"] == cli.config["trainer"].as_dict()
 
 
 def any_model_any_data_cli():