deprecate on_{train/val/test/predict}_dataloader() from DataHooks

CHANGELOG.md

@@ -157,6 +157,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 - Deprecated the `TestTubeLogger` ([#9065](https://github.com/PyTorchLightning/pytorch-lightning/pull/9065))
 
+- Deprecated `on_{train/val/test/predict}_dataloader()` from `LightningModule` and `LightningDataModule` [#9098](https://github.com/PyTorchLightning/pytorch-lightning/pull/9098)
+
+-
 
 ### Removed
 

pytorch_lightning/core/hooks.py

@@ -18,8 +18,9 @@
 import torch
 from torch.optim.optimizer import Optimizer
 
-from pytorch_lightning.utilities import move_data_to_device, rank_zero_warn
+from pytorch_lightning.utilities import move_data_to_device
 from pytorch_lightning.utilities.types import EVAL_DATALOADERS, STEP_OUTPUT, TRAIN_DATALOADERS
+from pytorch_lightning.utilities.warnings import rank_zero_deprecation, rank_zero_warn
 
 
 class ModelHooks:
@@ -681,16 +682,52 @@ def predict_dataloader(self) -> EVAL_DATALOADERS:
         """
 
     def on_train_dataloader(self) -> None:
-        """Called before requesting the train dataloader."""
+        """Called before requesting the train dataloader.
+
+        .. deprecated:: v1.5
+            :meth:`on_train_dataloader` is deprecated and will be removed in v1.7.0.
+            Please use :meth:`train_dataloader()` directly.
+        """
+        rank_zero_deprecation(
+            "Method `on_train_dataloader` in DataHooks is deprecated and will be removed in v1.7.0."
+            " Please use `train_dataloader()` directly."
+        )
 
     def on_val_dataloader(self) -> None:
-        """Called before requesting the val dataloader."""
+        """Called before requesting the val dataloader.
+
+        .. deprecated:: v1.5
+            :meth:`on_val_dataloader` is deprecated and will be removed in v1.7.0.
+            Please use :meth:`val_dataloader()` directly.
+        """
+        rank_zero_deprecation(
+            "Method `on_val_dataloader` in DataHooks is deprecated and will be removed in v1.7.0."
+            " Please use `val_dataloader()` directly."
+        )
 
     def on_test_dataloader(self) -> None:
-        """Called before requesting the test dataloader."""
+        """Called before requesting the test dataloader.
+
+        .. deprecated:: v1.5
+            :meth:`on_test_dataloader` is deprecated and will be removed in v1.7.0.
+            Please use :meth:`test_dataloader()` directly.
+        """
+        rank_zero_deprecation(
+            "Method `on_test_dataloader` in DataHooks is deprecated and will be removed in v1.7.0."
+            " Please use `test_dataloader()` directly."
+        )
 
     def on_predict_dataloader(self) -> None:
-        """Called before requesting the predict dataloader."""
+        """Called before requesting the predict dataloader.
+
+        .. deprecated:: v1.5
+            :meth:`on_predict_dataloader` is deprecated and will be removed in v1.7.0.
+            Please use :meth:`predict_dataloader()` directly.
+        """
+        rank_zero_deprecation(
+            "Method `on_predict_dataloader` in DataHooks is deprecated and will be removed in v1.7.0."
+            " Please use `predict_dataloader()` directly."
+        )
 
     def transfer_batch_to_device(self, batch: Any, device: torch.device, dataloader_idx: int) -> Any:
         """

pytorch_lightning/trainer/configuration_validator.py

@@ -13,7 +13,7 @@
 # limitations under the License.
 import pytorch_lightning as pl
 from pytorch_lightning.trainer.states import TrainerFn
-from pytorch_lightning.utilities import rank_zero_warn
+from pytorch_lightning.utilities import rank_zero_deprecation, rank_zero_warn
 from pytorch_lightning.utilities.exceptions import MisconfigurationException
 from pytorch_lightning.utilities.model_helpers import is_overridden
 from pytorch_lightning.utilities.signature_utils import is_param_in_hook_signature
@@ -75,6 +75,25 @@ def __verify_train_loop_configuration(self, model: "pl.LightningModule") -> None
                 " `training_step()`, `train_dataloader()` and `configure_optimizers()` to be defined."
             )
 
+        # ----------------------------------------------
+        # verify model does not have
+        # - on_train_dataloader
+        # - on_val_dataloader
+        # ----------------------------------------------
+        has_on_train_dataloader = is_overridden("on_train_dataloader", model)
+        if has_on_train_dataloader:
+            rank_zero_deprecation(
+                "Method `on_train_dataloader` in DataHooks is deprecated and will be removed in v1.7.0."
+                " Please use `train_dataloader()` directly."
+            )
+
+        has_on_val_dataloader = is_overridden("on_val_dataloader", model)
+        if has_on_val_dataloader:
+            rank_zero_deprecation(
+                "Method `on_val_dataloader` in DataHooks is deprecated and will be removed in v1.7.0."
+                " Please use `val_dataloader()` directly."
+            )
+
         trainer = self.trainer
 
         trainer.overriden_optimizer_step = is_overridden("optimizer_step", model)
@@ -102,10 +121,39 @@ def __verify_eval_loop_configuration(self, model: "pl.LightningModule", stage: s
         if has_step and not has_loader:
             rank_zero_warn(f"you defined a {step_name} but have no {loader_name}. Skipping {stage} loop")
 
+        # ----------------------------------------------
+        # verify model does not have
+        # - on_val_dataloader
+        # - on_test_dataloader
+        # ----------------------------------------------
+        has_on_val_dataloader = is_overridden("on_val_dataloader", model)
+        if has_on_val_dataloader:
+            rank_zero_deprecation(
+                "Method `on_val_dataloader` in DataHooks is deprecated and will be removed in v1.7.0."
+                " Please use `val_dataloader()` directly."
+            )
+
+        has_on_test_dataloader = is_overridden("on_test_dataloader", model)
+        if has_on_test_dataloader:
+            rank_zero_deprecation(
+                "Method `on_test_dataloader` in DataHooks is deprecated and will be removed in v1.7.0."
+                " Please use `test_dataloader()` directly."
+            )
+
     def __verify_predict_loop_configuration(self, model: "pl.LightningModule") -> None:
         has_predict_dataloader = is_overridden("predict_dataloader", model)
         if not has_predict_dataloader:
             raise MisconfigurationException("Dataloader not found for `Trainer.predict`")
+        # ----------------------------------------------
+        # verify model does not have
+        # - on_predict_dataloader
+        # ----------------------------------------------
+        has_on_predict_dataloader = is_overridden("on_predict_dataloader", model)
+        if has_on_predict_dataloader:
+            rank_zero_deprecation(
+                "Method `on_predict_dataloader` in DataHooks is deprecated and will be removed in v1.7.0."
+                " Please use `predict_dataloader()` directly."
+            )
 
     def __verify_dp_batch_transfer_support(self, model: "pl.LightningModule") -> None:
         """Raise Misconfiguration exception since these hooks are not supported in DP mode"""

tests/deprecated_api/test_remove_1-7.py

@@ -91,6 +91,27 @@ def test_v1_7_0_trainer_prepare_data_per_node(tmpdir):
         _ = Trainer(prepare_data_per_node=False)
 
 
+def test_v1_7_0_deprecated_on_train_dataloader(tmpdir):
+
+    model = BoringModel()
+    with pytest.deprecated_call(
+        match="Method `on_train_dataloader` in DataHooks is deprecated and will be removed in v1.7.0."
+    ):
+        model.on_train_dataloader()
+    with pytest.deprecated_call(
+        match="Method `on_val_dataloader` in DataHooks is deprecated and will be removed in v1.7.0."
+    ):
+        model.on_val_dataloader()
+    with pytest.deprecated_call(
+        match="Method `on_test_dataloader` in DataHooks is deprecated and will be removed in v1.7.0."
+    ):
+        model.on_test_dataloader()
+    with pytest.deprecated_call(
+        match="Method `on_predict_dataloader` in DataHooks is deprecated and will be removed in v1.7.0."
+    ):
+        model.on_predict_dataloader()
+
+
 @mock.patch("pytorch_lightning.loggers.test_tube.Experiment")
 def test_v1_7_0_test_tube_logger(_, tmpdir):
     with pytest.deprecated_call(match="The TestTubeLogger is deprecated since v1.5 and will be removed in v1.7"):

tests/trainer/test_trainer.py

@@ -1868,3 +1868,30 @@ def test_error_handling_all_stages(tmpdir, accelerator, num_processes):
         trainer.test(model)
     with pytest.raises(Exception, match=r"Error during predict"), patch("pytorch_lightning.Trainer._on_exception"):
         trainer.predict(model, model.val_dataloader(), return_predictions=False)
+
+
+def test_overridden_on_dataloaders(tmpdir):
+    model = BoringModel()
+    with pytest.deprecated_call(
+        match="Method `on_train_dataloader` in DataHooks is deprecated and will be removed in v1.7.0."
+    ):
+        trainer = Trainer(default_root_dir=tmpdir, fast_dev_run=True)
+        trainer.fit(model)
+
+    with pytest.deprecated_call(
+        match="Method `on_val_dataloader` in DataHooks is deprecated and will be removed in v1.7.0."
+    ):
+        trainer = Trainer(default_root_dir=tmpdir, fast_dev_run=True)
+        trainer.validate(model)
+
+    with pytest.deprecated_call(
+        match="Method `on_test_dataloader` in DataHooks is deprecated and will be removed in v1.7.0."
+    ):
+        trainer = Trainer(default_root_dir=tmpdir, fast_dev_run=True)
+        trainer.test(model)
+
+    with pytest.deprecated_call(
+        match="Method `on_predict_dataloader` in DataHooks is deprecated and will be removed in v1.7.0."
+    ):
+        trainer = Trainer(default_root_dir=tmpdir, fast_dev_run=True)
+        trainer.predict(model)