Custom argparser extension with Trainer arguments (argument types added) (#1147)

* `add_argparse_args` method fixed (argument types added)

* CHANGELOG.md upd

* autopep8 fixes

* --gpus=0 removed from test (for ci tests)

* typo fixed

* reduce on plateau scheduler fixed

* Trainer cli related tests moved to test_trainer_cli.py

* refactored: get_init_arguments_and_types is a public classmethod of the Trainer now

* test_get_init_arguments_and_types added

* autopep8 fixes

* Trainer cli related tests moved to test_trainer_cli.py

* refactored: get_init_arguments_and_types is a public classmethod of the Trainer now

* test_get_init_arguments_and_types added

* autopep8 fixes

* Trainer cli related tests moved to test_trainer_cli.py

* refactored: get_init_arguments_and_types is a public classmethod of the Trainer now

* test_get_init_arguments_and_types added

* autopep8 fixes

* Trainer cli related tests moved to test_trainer_cli.py

* test_get_init_arguments_and_types added

* autopep8 fixes

* Apply suggestions from code review

* cosmetics

* cosmetics

* Update pytorch_lightning/trainer/trainer.py

Co-Authored-By: Jirka Borovec <Borda@users.noreply.github.com>

* `Trainer.get_init_arguments_and_types` now returns arg types wrapped in tuples (not in sets)

* deprecated args are now ignored in argparser

* get_deprecated_arg_names small refactor

* get_deprecated_arg_names bug fixed

* Trainer cli related tests moved to test_trainer_cli.py

* refactored: get_init_arguments_and_types is a public classmethod of the Trainer now

* test_get_init_arguments_and_types added

* autopep8 fixes

* Trainer cli related tests moved to test_trainer_cli.py

* autopep8 fixes

* Trainer cli related tests moved to test_trainer_cli.py

* Trainer cli related tests moved to test_trainer_cli.py

* test_get_init_arguments_and_types added

* autopep8 fixes

* autopep8 fixes

* Apply suggestions from code review

* cosmetics

* cosmetics

* Update pytorch_lightning/trainer/trainer.py

Co-Authored-By: Jirka Borovec <Borda@users.noreply.github.com>

* `Trainer.get_init_arguments_and_types` now returns arg types wrapped in tuples (not in sets)

* deprecated args are now ignored in argparser

* get_deprecated_arg_names small refactor

* get_deprecated_arg_names bug fixed

* Update pytorch_lightning/trainer/trainer.py

Co-Authored-By: Joe Davison <joe@huggingface.co>

* Update pytorch_lightning/trainer/trainer.py

Co-Authored-By: Joe Davison <joe@huggingface.co>

Co-authored-by: Jirka Borovec <Borda@users.noreply.github.com>
Co-authored-by: Joe Davison <joe@huggingface.co>
Co-authored-by: William Falcon <waf2107@columbia.edu>

CHANGELOG.md

@@ -29,7 +29,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 ### Fixed
 
-- Fixed bug related to type checking of `ReduceLROnPlateau` lr schedulers([#1114](https://github.com/PyTorchLightning/pytorch-lightning/issues/1114))
+
+- `Trainer.add_argparse_args` classmethod fixed. Now it adds a type for the arguments ([#1147](https://github.com/PyTorchLightning/pytorch-lightning/pull/1147)).
+- Fixed bug related to type cheking of `ReduceLROnPlateau` lr schedulers([#1114](https://github.com/PyTorchLightning/pytorch-lightning/issues/1114))
 - Fixed a bug to ensure lightning checkpoints to be backward compatible ([#1132](https://github.com/PyTorchLightning/pytorch-lightning/pull/1132))
 - Fixed all warnings and errors in the docs build process ([#1191](https://github.com/PyTorchLightning/pytorch-lightning/pull/1191))
 

pl_examples/full_examples/semantic_segmentation/models/unet/model.py

@@ -13,6 +13,7 @@ class UNet(nn.Module):
     bilinear (bool) - Whether to use bilinear interpolation or transposed
     convolutions for upsampling.
     '''
+
     def __init__(self, num_classes=19, bilinear=False):
         super().__init__()
         self.layer1 = DoubleConv(3, 64)

pl_examples/full_examples/semantic_segmentation/models/unet/parts.py

@@ -8,6 +8,7 @@ class DoubleConv(nn.Module):
     Double Convolution and BN and ReLU
     (3x3 conv -> BN -> ReLU) ** 2
     '''
+
     def __init__(self, in_ch, out_ch):
         super().__init__()
         self.net = nn.Sequential(
@@ -27,6 +28,7 @@ class Down(nn.Module):
     '''
     Combination of MaxPool2d and DoubleConv in series
     '''
+
     def __init__(self, in_ch, out_ch):
         super().__init__()
         self.net = nn.Sequential(
@@ -44,6 +46,7 @@ class Up(nn.Module):
     followed by concatenation of feature map from contracting path,
     followed by double 3x3 convolution.
     '''
+
     def __init__(self, in_ch, out_ch, bilinear=False):
         super().__init__()
         self.upsample = None

pl_examples/full_examples/semantic_segmentation/semseg.py

@@ -34,6 +34,7 @@ class KITTI(Dataset):
     encoded using `encode_segmap`, and given `transform` (if any) are applied to the image only
     (mask does not usually require transforms, but they can be implemented in a similar way).
     '''
+
     def __init__(
         self,
         root_path,
@@ -120,6 +121,7 @@ class SegModel(pl.LightningModule):
 
     Adam optimizer is used along with Cosine Annealing learning rate scheduler.
     '''
+
     def __init__(self, hparams):
         super(SegModel, self).__init__()
         self.root_path = hparams.root

pytorch_lightning/trainer/trainer.py

@@ -3,33 +3,30 @@ import os
 import sys
 import warnings
 from argparse import ArgumentParser
-from typing import Union, Optional, List, Dict, Tuple, Iterable
+from typing import Union, Optional, List, Dict, Tuple, Iterable, Any
+import distutils
 
 import torch
-from torch import optim
 import torch.distributed as torch_distrib
 import torch.multiprocessing as mp
+from torch import optim
 from torch.optim.optimizer import Optimizer
 from torch.utils.data import DataLoader
 from tqdm.auto import tqdm
 
 from pytorch_lightning import _logger as log
 from pytorch_lightning.callbacks import ModelCheckpoint, EarlyStopping, Callback
+from pytorch_lightning.core.lightning import LightningModule
 from pytorch_lightning.loggers import LightningLoggerBase
 from pytorch_lightning.profiler import Profiler, PassThroughProfiler
 from pytorch_lightning.profiler.profiler import BaseProfiler
 from pytorch_lightning.trainer.auto_mix_precision import TrainerAMPMixin
 from pytorch_lightning.trainer.callback_config import TrainerCallbackConfigMixin
-from pytorch_lightning.trainer.data_loading import TrainerDataLoadingMixin
-from pytorch_lightning.trainer.distrib_data_parallel import TrainerDDPMixin
-from pytorch_lightning.trainer.distrib_parts import (
-    TrainerDPMixin,
-    parse_gpu_ids,
-    determine_root_gpu_device
-)
-from pytorch_lightning.core.lightning import LightningModule
 from pytorch_lightning.trainer.callback_hook import TrainerCallbackHookMixin
+from pytorch_lightning.trainer.data_loading import TrainerDataLoadingMixin
 from pytorch_lightning.trainer.deprecated_api import TrainerDeprecatedAPITillVer0_8
+from pytorch_lightning.trainer.distrib_data_parallel import TrainerDDPMixin
+from pytorch_lightning.trainer.distrib_parts import TrainerDPMixin, parse_gpu_ids, determine_root_gpu_device
 from pytorch_lightning.trainer.evaluation_loop import TrainerEvaluationLoopMixin
 from pytorch_lightning.trainer.logging import TrainerLoggingMixin
 from pytorch_lightning.trainer.model_hooks import TrainerModelHooksMixin
@@ -70,6 +67,11 @@ class Trainer(
     TrainerCallbackHookMixin,
     TrainerDeprecatedAPITillVer0_8,
 ):
+    DEPRECATED_IN_0_8 = (
+        'gradient_clip', 'nb_gpu_nodes', 'max_nb_epochs', 'min_nb_epochs',
+        'add_row_log_interval', 'nb_sanity_val_steps'
+    )
+    DEPRECATED_IN_0_9 = ('use_amp',)
 
     def __init__(
             self,
@@ -467,20 +469,90 @@ class Trainer(
         return args
 
     @classmethod
-    def add_argparse_args(cls, parent_parser: ArgumentParser) -> ArgumentParser:
-        """Extend existing argparse by default `Trainer` attributes."""
-        parser = ArgumentParser(parents=[parent_parser], add_help=False)
+    def get_init_arguments_and_types(cls) -> List[Tuple[str, Tuple, Any]]:
+        r"""Scans the Trainer signature and returns argument names, types and default values.
 
-        trainer_default_params = Trainer.default_attributes()
+        Returns:
+            List with tuples of 3 values:
+            (argument name, set with argument types, argument default value).
 
-        # TODO: get "help" from docstring :)
+        Examples:
+            >>> args = Trainer.get_init_arguments_and_types()
+            >>> import pprint
+            >>> pprint.pprint(sorted(args))  # doctest: +ELLIPSIS +NORMALIZE_WHITESPACE
+            [('accumulate_grad_batches',
+              (<class 'int'>, typing.Dict[int, int], typing.List[list]),
+              1),
+             ...
+             ('callbacks', (<class 'pytorch_lightning.callbacks.base.Callback'>,), []),
+             ('check_val_every_n_epoch', (<class 'int'>,), 1),
+             ...
+             ('max_epochs', (<class 'int'>,), 1000),
+             ...
+             ('precision', (<class 'int'>,), 32),
+             ('print_nan_grads', (<class 'bool'>,), False),
+             ('process_position', (<class 'int'>,), 0),
+             ('profiler',
+              (<class 'pytorch_lightning.profiler.profiler.BaseProfiler'>,
+               <class 'NoneType'>),
+              None),
+            ...
+        """
+        trainer_default_params = inspect.signature(cls).parameters
+        name_type_default = []
         for arg in trainer_default_params:
-            parser.add_argument(
-                f'--{arg}',
-                default=trainer_default_params[arg],
-                dest=arg,
-                help='autogenerated by pl.Trainer'
-            )
+            arg_type = trainer_default_params[arg].annotation
+            arg_default = trainer_default_params[arg].default
+            try:
+                arg_types = tuple(arg_type.__args__)
+            except AttributeError:
+                arg_types = (arg_type,)
+
+            name_type_default.append((arg, arg_types, arg_default))
+
+        return name_type_default
+
+    @classmethod
+    def get_deprecated_arg_names(cls) -> List:
+        """Returns a list with deprecated Trainer arguments."""
+        depr_arg_names = []
+        for name, val in cls.__dict__.items():
+            if name.startswith('DEPRECATED') and isinstance(val, (tuple, list)):
+                depr_arg_names.extend(val)
+        return depr_arg_names
+
+    @classmethod
+    def add_argparse_args(cls, parent_parser: ArgumentParser) -> ArgumentParser:
+        r"""Extends existing argparse by default `Trainer` attributes.
+
+        Args:
+            parent_parser:
+                The custom cli arguments parser, which will be extended by
+                the Trainer default arguments.
+
+        Only arguments of the allowed types (str, float, int, bool) will
+        extend the `parent_parser`.
+        """
+        parser = ArgumentParser(parents=[parent_parser], add_help=False, )
+
+        depr_arg_names = cls.get_deprecated_arg_names()
+
+        allowed_types = (str, float, int, bool)
+        # TODO: get "help" from docstring :)
+        for arg, arg_types, arg_default in cls.get_init_arguments_and_types():
+            if arg not in depr_arg_names:
+                for allowed_type in allowed_types:
+                    if allowed_type in arg_types:
+                        if allowed_type is bool:
+                            allowed_type = lambda x: bool(distutils.util.strtobool(x))
+                        parser.add_argument(
+                            f'--{arg}',
+                            default=arg_default,
+                            type=allowed_type,
+                            dest=arg,
+                            help='autogenerated by pl.Trainer'
+                        )
+                        break
 
         return parser
 

tests/trainer/test_trainer.py

@@ -1,8 +1,7 @@
 import glob
 import math
 import os
-from argparse import ArgumentParser, Namespace
-from unittest import mock
+from argparse import Namespace
 
 import pytest
 import torch
@@ -251,6 +250,7 @@ def test_dp_output_reduce():
 
 def test_model_checkpoint_options(tmpdir):
     """Test ModelCheckpoint options."""
+
     def mock_save_function(filepath):
         open(filepath, 'a').close()
 
@@ -624,23 +624,3 @@ def test_testpass_overrides(tmpdir):
 
     model = LightningTestModel(hparams)
     Trainer().test(model)
-
-
-@mock.patch('argparse.ArgumentParser.parse_args',
-            return_value=Namespace(**Trainer.default_attributes()))
-def test_default_args(tmpdir):
-    """Tests default argument parser for Trainer"""
-    tutils.reset_seed()
-
-    # logger file to get meta
-    logger = tutils.get_test_tube_logger(tmpdir, False)
-
-    parser = ArgumentParser(add_help=False)
-    args = parser.parse_args()
-    args.logger = logger
-
-    args.max_epochs = 5
-    trainer = Trainer.from_argparse_args(args)
-
-    assert isinstance(trainer, Trainer)
-    assert trainer.max_epochs == 5

tests/trainer/test_trainer_cli.py

@@ -0,0 +1,85 @@
+import inspect
+from argparse import ArgumentParser, Namespace
+from unittest import mock
+
+import pytest
+
+import tests.models.utils as tutils
+from pytorch_lightning import Trainer
+
+
+@mock.patch('argparse.ArgumentParser.parse_args',
+            return_value=Namespace(**Trainer.default_attributes()))
+def test_default_args(tmpdir):
+    """Tests default argument parser for Trainer"""
+    tutils.reset_seed()
+
+    # logger file to get meta
+    logger = tutils.get_test_tube_logger(tmpdir, False)
+
+    parser = ArgumentParser(add_help=False)
+    args = parser.parse_args()
+    args.logger = logger
+
+    args.max_epochs = 5
+    trainer = Trainer.from_argparse_args(args)
+
+    assert isinstance(trainer, Trainer)
+    assert trainer.max_epochs == 5
+
+
+@pytest.mark.parametrize('cli_args', [
+    ['--accumulate_grad_batches=22'],
+    ['--print_nan_grads=1', '--weights_save_path=./'],
+    []
+])
+def test_add_argparse_args_redefined(cli_args):
+    """Redefines some default Trainer arguments via the cli and
+    tests the Trainer initialization correctness.
+    """
+    parser = ArgumentParser(add_help=False)
+    parser = Trainer.add_argparse_args(parent_parser=parser)
+
+    args = parser.parse_args(cli_args)
+
+    # Check few deprecated args are not in namespace:
+    for depr_name in ('gradient_clip', 'nb_gpu_nodes', 'max_nb_epochs'):
+        assert depr_name not in args
+
+    trainer = Trainer.from_argparse_args(args=args)
+    assert isinstance(trainer, Trainer)
+
+
+def test_get_init_arguments_and_types():
+    """Asserts a correctness of the `get_init_arguments_and_types` Trainer classmethod."""
+    args = Trainer.get_init_arguments_and_types()
+    parameters = inspect.signature(Trainer).parameters
+    assert len(parameters) == len(args)
+    for arg in args:
+        assert parameters[arg[0]].default == arg[2]
+
+    kwargs = {arg[0]: arg[2] for arg in args}
+    trainer = Trainer(**kwargs)
+    assert isinstance(trainer, Trainer)
+
+
+@pytest.mark.parametrize('cli_args', [
+    ['--callbacks=1', '--logger'],
+    ['--foo', '--bar=1']
+])
+def test_add_argparse_args_redefined_error(cli_args, monkeypatch):
+    """Asserts thar an error raised in case of passing not default cli arguments."""
+
+    class _UnkArgError(Exception):
+        pass
+
+    def _raise():
+        raise _UnkArgError
+
+    parser = ArgumentParser(add_help=False)
+    parser = Trainer.add_argparse_args(parent_parser=parser)
+
+    monkeypatch.setattr(parser, 'exit', lambda *args: _raise(), raising=True)
+
+    with pytest.raises(_UnkArgError):
+        parser.parse_args(cli_args)