Removed the deprecated trainer_data_loading_mixin (#14888)

Author: NeoKish

src/pytorch_lightning/CHANGELOG.md

@@ -232,6 +232,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 - Remove the deprecated `Trainer.should_rank_save_checkpoint` ([#14885](https://github.com/Lightning-AI/lightning/pull/14885))
 
+- Removed the deprecated `TrainerDataLoadingMixin` ([#14888](https://github.com/Lightning-AI/lightning/pull/14888))
+
 
 ### Fixed
 

src/pytorch_lightning/trainer/data_loading.py

@@ -75,7 +75,6 @@
 from pytorch_lightning.trainer.connectors.logger_connector import LoggerConnector
 from pytorch_lightning.trainer.connectors.logger_connector.result import _ResultCollection
 from pytorch_lightning.trainer.connectors.signal_connector import SignalConnector
-from pytorch_lightning.trainer.data_loading import TrainerDataLoadingMixin
 from pytorch_lightning.trainer.optimizers import TrainerOptimizersMixin
 from pytorch_lightning.trainer.states import RunningStage, TrainerFn, TrainerState, TrainerStatus
 from pytorch_lightning.trainer.supporters import CombinedLoader
@@ -112,7 +111,6 @@
 
 class Trainer(
     TrainerOptimizersMixin,  # TODO: Remove in v1.8
-    TrainerDataLoadingMixin,  # TODO: Remove in v1.8
 ):
     @_defaults_from_env_vars
     def __init__(

src/pytorch_lightning/trainer/trainer.py

@@ -22,7 +22,6 @@
 from pytorch_lightning.demos.boring_classes import BoringDataModule, BoringModel
 from pytorch_lightning.strategies.ipu import LightningIPUModule
 from pytorch_lightning.trainer.configuration_validator import _check_datamodule_checkpoint_hooks
-from pytorch_lightning.trainer.states import RunningStage
 
 
 def test_v1_8_0_on_init_start_end(tmpdir):
@@ -93,22 +92,6 @@ def test_v1_8_0_trainer_optimizers_mixin():
         trainer.convert_to_lightning_optimizers()
 
 
-def test_v1_8_0_deprecate_trainer_data_loading_mixin():
-    trainer = Trainer(max_epochs=1)
-    model = BoringModel()
-    dm = BoringDataModule()
-    trainer.fit(model, datamodule=dm)
-
-    with pytest.deprecated_call(
-        match=r"`TrainerDataLoadingMixin.prepare_dataloader` was deprecated in v1.6 and will be removed in v1.8.",
-    ):
-        trainer.prepare_dataloader(dataloader=model.train_dataloader, shuffle=False)
-    with pytest.deprecated_call(
-        match=r"`TrainerDataLoadingMixin.request_dataloader` was deprecated in v1.6 and will be removed in v1.8.",
-    ):
-        trainer.request_dataloader(stage=RunningStage.TRAINING)
-
-
 def test_v_1_8_0_deprecated_device_stats_monitor_prefix_metric_keys():
     from pytorch_lightning.callbacks.device_stats_monitor import prefix_metric_keys