simplify skip-if tests >> 0/n (#5920)

* skipif + yapf + isort

* tests

* docs

* pp

pytorch_lightning/accelerators/accelerator.py

@@ -29,7 +29,6 @@ if TYPE_CHECKING:
 
     from pytorch_lightning.trainer.trainer import Trainer
 
-
 _STEP_OUTPUT_TYPE = Union[torch.Tensor, Dict[str, torch.Tensor], None]
 
 
@@ -224,9 +223,7 @@ class Accelerator(object):
         with self.precision_plugin.predict_context(), self.training_type_plugin.predict_context():
             return self.training_type_plugin.predict(*args)
 
-    def training_step_end(
-        self, output: _STEP_OUTPUT_TYPE
-    ) -> _STEP_OUTPUT_TYPE:
+    def training_step_end(self, output: _STEP_OUTPUT_TYPE) -> _STEP_OUTPUT_TYPE:
         """A hook to do something at the end of the training step
 
         Args:
@@ -234,9 +231,7 @@ class Accelerator(object):
         """
         return self.training_type_plugin.training_step_end(output)
 
-    def test_step_end(
-        self, output: _STEP_OUTPUT_TYPE
-    ) -> _STEP_OUTPUT_TYPE:
+    def test_step_end(self, output: _STEP_OUTPUT_TYPE) -> _STEP_OUTPUT_TYPE:
         """A hook to do something at the end of the test step
 
         Args:
@@ -244,9 +239,7 @@ class Accelerator(object):
         """
         return self.training_type_plugin.test_step_end(output)
 
-    def validation_step_end(
-        self, output: _STEP_OUTPUT_TYPE
-    ) -> _STEP_OUTPUT_TYPE:
+    def validation_step_end(self, output: _STEP_OUTPUT_TYPE) -> _STEP_OUTPUT_TYPE:
         """A hook to do something at the end of the validation step
 
         Args:
@@ -400,9 +393,7 @@ class Accelerator(object):
         """
         return self.training_type_plugin.broadcast(obj, src)
 
-    def all_gather(
-        self, tensor: torch.Tensor, group: Optional[Any] = None, sync_grads: bool = False
-    ) -> torch.Tensor:
+    def all_gather(self, tensor: torch.Tensor, group: Optional[Any] = None, sync_grads: bool = False) -> torch.Tensor:
         """
         Function to gather a tensor from several distributed processes.
 

pytorch_lightning/accelerators/tpu.py

@@ -36,9 +36,7 @@ class TPUAccelerator(Accelerator):
     ) -> None:
         xm.optimizer_step(optimizer, optimizer_args={'closure': lambda_closure, **kwargs})
 
-    def all_gather(
-        self, tensor: torch.Tensor, group: Optional[Any] = None, sync_grads: bool = False
-    ) -> torch.Tensor:
+    def all_gather(self, tensor: torch.Tensor, group: Optional[Any] = None, sync_grads: bool = False) -> torch.Tensor:
         """
         Function to gather a tensor from several distributed processes
         Args:

pytorch_lightning/plugins/precision/deepspeed_precision.py

@@ -75,9 +75,7 @@ class DeepSpeedPrecisionPlugin(PrecisionPlugin):
 
         return closure_loss
 
-    def clip_gradients(
-        self, optimizer: 'Optimizer', clip_val: Union[int, float], norm_type: float = 2.0
-    ) -> None:
+    def clip_gradients(self, optimizer: 'Optimizer', clip_val: Union[int, float], norm_type: float = 2.0) -> None:
         """
         DeepSpeed handles clipping gradients via the training type plugin.
         """

pytorch_lightning/plugins/precision/sharded_native_amp.py

@@ -32,8 +32,6 @@ class ShardedNativeMixedPrecisionPlugin(NativeMixedPrecisionPlugin):
         super().__init__()
         self.scaler = ShardedGradScaler()
 
-    def clip_gradients(
-        self, optimizer: 'Optimizer', clip_val: Union[int, float], norm_type: float = 2.0
-    ) -> None:
+    def clip_gradients(self, optimizer: 'Optimizer', clip_val: Union[int, float], norm_type: float = 2.0) -> None:
         optimizer = cast(OSS, optimizer)
         optimizer.clip_grad_norm(clip_val, norm_type=norm_type)

pytorch_lightning/trainer/callback_hook.py

@@ -15,7 +15,7 @@
 from abc import ABC
 from copy import deepcopy
 from inspect import signature
-from typing import List, Dict, Any, Type, Callable
+from typing import Any, Callable, Dict, List, Type
 
 from pytorch_lightning.callbacks import Callback
 from pytorch_lightning.core.lightning import LightningModule
@@ -214,8 +214,7 @@ class TrainerCallbackHookMixin(ABC):
                 rank_zero_warn(
                     "`Callback.on_save_checkpoint` signature has changed in v1.3."
                     " A `checkpoint` parameter has been added."
-                    " Support for the old signature will be removed in v1.5",
-                    DeprecationWarning
+                    " Support for the old signature will be removed in v1.5", DeprecationWarning
                 )
                 state = callback.on_save_checkpoint(self, self.lightning_module)  # noqa: parameter-unfilled
             else:

pytorch_lightning/utilities/apply_func.py

@@ -22,8 +22,7 @@ import numpy as np
 import torch
 
 from pytorch_lightning.utilities.exceptions import MisconfigurationException
-from pytorch_lightning.utilities.imports import _TORCHTEXT_AVAILABLE
-from pytorch_lightning.utilities.imports import _module_available
+from pytorch_lightning.utilities.imports import _module_available, _TORCHTEXT_AVAILABLE
 
 if _TORCHTEXT_AVAILABLE:
     if _module_available("torchtext.legacy.data"):

tests/__init__.py

@@ -14,9 +14,6 @@
 import os
 
 import numpy as np
-import torch
-
-from pytorch_lightning.utilities import _TORCH_LOWER_EQUAL_1_4, _TORCH_QUANTIZE_AVAILABLE
 
 _TEST_ROOT = os.path.dirname(__file__)
 _PROJECT_ROOT = os.path.dirname(_TEST_ROOT)
@@ -34,13 +31,3 @@ RANDOM_PORTS = list(np.random.randint(12000, 19000, 1000))
 
 if not os.path.isdir(_TEMP_PATH):
     os.mkdir(_TEMP_PATH)
-
-_MISS_QUANT_DEFAULT = 'fbgemm' not in torch.backends.quantized.supported_engines
-
-_SKIPIF_ARGS_PT_LE_1_4 = dict(condition=_TORCH_LOWER_EQUAL_1_4, reason="test pytorch > 1.4")
-_SKIPIF_ARGS_NO_GPU = dict(condition=not torch.cuda.is_available(), reason="test requires single-GPU machine")
-_SKIPIF_ARGS_NO_GPUS = dict(condition=torch.cuda.device_count() < 2, reason="test requires multi-GPU machine")
-_SKIPIF_ARGS_NO_PT_QUANT = dict(
-    condition=not _TORCH_QUANTIZE_AVAILABLE or _MISS_QUANT_DEFAULT,
-    reason="PyTorch quantization is needed for this test"
-)

tests/callbacks/test_quantization.py

@@ -20,16 +20,17 @@ from pytorch_lightning import seed_everything, Trainer
 from pytorch_lightning.callbacks import QuantizationAwareTraining
 from pytorch_lightning.metrics.functional.mean_relative_error import mean_relative_error
 from pytorch_lightning.utilities.exceptions import MisconfigurationException
-from tests import _SKIPIF_ARGS_NO_PT_QUANT, _SKIPIF_ARGS_PT_LE_1_4
 from tests.helpers.datamodules import RegressDataModule
 from tests.helpers.simple_models import RegressionModel
+from tests.helpers.skipif import skipif_args
 
 
 @pytest.mark.parametrize(
-    "observe", ['average', pytest.param('histogram', marks=pytest.mark.skipif(**_SKIPIF_ARGS_PT_LE_1_4))]
+    "observe",
+    ['average', pytest.param('histogram', marks=pytest.mark.skipif(**skipif_args(min_torch="1.5")))]
 )
 @pytest.mark.parametrize("fuse", [True, False])
-@pytest.mark.skipif(**_SKIPIF_ARGS_NO_PT_QUANT)
+@pytest.mark.skipif(**skipif_args(quant_available=True))
 def test_quantization(tmpdir, observe, fuse):
     """Parity test for quant model"""
     seed_everything(42)
@@ -64,7 +65,7 @@ def test_quantization(tmpdir, observe, fuse):
     assert torch.allclose(org_score, quant_score, atol=0.45)
 
 
-@pytest.mark.skipif(**_SKIPIF_ARGS_NO_PT_QUANT)
+@pytest.mark.skipif(**skipif_args(quant_available=True))
 def test_quantize_torchscript(tmpdir):
     """Test converting to torchscipt """
     dm = RegressDataModule()
@@ -80,7 +81,7 @@ def test_quantize_torchscript(tmpdir):
     tsmodel(tsmodel.quant(batch[0]))
 
 
-@pytest.mark.skipif(**_SKIPIF_ARGS_NO_PT_QUANT)
+@pytest.mark.skipif(**skipif_args(quant_available=True))
 def test_quantization_exceptions(tmpdir):
     """Test wrong fuse layers"""
     with pytest.raises(MisconfigurationException, match='Unsupported qconfig'):
@@ -123,7 +124,7 @@ def custom_trigger_last(trainer):
         (custom_trigger_last, 2),
     ]
 )
-@pytest.mark.skipif(**_SKIPIF_ARGS_NO_PT_QUANT)
+@pytest.mark.skipif(**skipif_args(quant_available=True))
 def test_quantization_triggers(tmpdir, trigger_fn, expected_count):
     """Test  how many times the quant is called"""
     dm = RegressDataModule()

tests/core/test_results.py

@@ -25,8 +25,8 @@ import tests.helpers.utils as tutils
 from pytorch_lightning import Trainer
 from pytorch_lightning.core.step_result import Result
 from pytorch_lightning.trainer.states import TrainerState
-from tests import _SKIPIF_ARGS_NO_GPU
 from tests.helpers import BoringDataModule, BoringModel
+from tests.helpers.skipif import skipif_args
 
 
 def _setup_ddp(rank, worldsize):
@@ -72,7 +72,7 @@ def test_result_reduce_ddp(result_cls):
         pytest.param(5, False, 0, id='nested_list_predictions'),
         pytest.param(6, False, 0, id='dict_list_predictions'),
         pytest.param(7, True, 0, id='write_dict_predictions'),
-        pytest.param(0, True, 1, id='full_loop_single_gpu', marks=pytest.mark.skipif(**_SKIPIF_ARGS_NO_GPU))
+        pytest.param(0, True, 1, id='full_loop_single_gpu', marks=pytest.mark.skipif(**skipif_args(min_gpus=1)))
     ]
 )
 def test_result_obj_predictions(tmpdir, test_option, do_train, gpus):

tests/deprecated_api/test_remove_1-5.py

@@ -17,7 +17,7 @@ from unittest import mock
 
 import pytest
 
-from pytorch_lightning import Trainer, Callback
+from pytorch_lightning import Callback, Trainer
 from pytorch_lightning.loggers import WandbLogger
 from tests.helpers import BoringModel
 from tests.helpers.utils import no_warning_call
@@ -30,7 +30,9 @@ def test_v1_5_0_wandb_unused_sync_step(tmpdir):
 
 
 def test_v1_5_0_old_callback_on_save_checkpoint(tmpdir):
+
     class OldSignature(Callback):
+
         def on_save_checkpoint(self, trainer, pl_module):  # noqa
             ...
 
@@ -49,14 +51,17 @@ def test_v1_5_0_old_callback_on_save_checkpoint(tmpdir):
         trainer.save_checkpoint(filepath)
 
     class NewSignature(Callback):
+
         def on_save_checkpoint(self, trainer, pl_module, checkpoint):
             ...
 
     class ValidSignature1(Callback):
+
         def on_save_checkpoint(self, trainer, *args):
             ...
 
     class ValidSignature2(Callback):
+
         def on_save_checkpoint(self, *args):
             ...
 

tests/helpers/skipif.py

@@ -0,0 +1,72 @@
+# Copyright The PyTorch Lightning team.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+from distutils.version import LooseVersion
+from typing import Optional
+
+import pytest
+import torch
+from pkg_resources import get_distribution
+
+from pytorch_lightning.utilities import _TORCH_QUANTIZE_AVAILABLE
+
+
+def skipif_args(
+    min_gpus: int = 0,
+    min_torch: Optional[str] = None,
+    quant_available: bool = False,
+) -> dict:
+    """ Creating aggregated arguments for standard pytest skipif, sot the usecase is::
+
+        @pytest.mark.skipif(**create_skipif(min_torch="99"))
+        def test_any_func(...):
+            ...
+
+    >>> from pprint import pprint
+    >>> pprint(skipif_args(min_torch="99", min_gpus=0))
+    {'condition': True, 'reason': 'Required: [torch>=99]'}
+    >>> pprint(skipif_args(min_torch="0.0", min_gpus=0))  # doctest: +NORMALIZE_WHITESPACE
+    {'condition': False, 'reason': 'Conditions satisfied, going ahead with the test.'}
+    """
+    conditions = []
+    reasons = []
+
+    if min_gpus:
+        conditions.append(torch.cuda.device_count() < min_gpus)
+        reasons.append(f"GPUs>={min_gpus}")
+
+    if min_torch:
+        torch_version = LooseVersion(get_distribution("torch").version)
+        conditions.append(torch_version < LooseVersion(min_torch))
+        reasons.append(f"torch>={min_torch}")
+
+    if quant_available:
+        _miss_default = 'fbgemm' not in torch.backends.quantized.supported_engines
+        conditions.append(not _TORCH_QUANTIZE_AVAILABLE or _miss_default)
+        reasons.append("PyTorch quantization is available")
+
+    if not any(conditions):
+        return dict(condition=False, reason="Conditions satisfied, going ahead with the test.")
+
+    reasons = [rs for cond, rs in zip(conditions, reasons) if cond]
+    return dict(condition=any(conditions), reason=f"Required: [{' + '.join(reasons)}]",)
+
+
+@pytest.mark.skipif(**skipif_args(min_torch="99"))
+def test_always_skip():
+    exit(1)
+
+
+@pytest.mark.skipif(**skipif_args(min_torch="0.0"))
+def test_always_pass():
+    assert True

tests/trainer/optimization/test_optimizers.py

@@ -34,7 +34,7 @@ def test_optimizer_with_scheduling(tmpdir):
         max_epochs=1,
         limit_val_batches=0.1,
         limit_train_batches=0.2,
-        val_check_interval=0.5
+        val_check_interval=0.5,
     )
     trainer.fit(model)
     assert trainer.state == TrainerState.FINISHED, f"Training failed with {trainer.state}"