Remove the deprecated run_stage (#14870)

Author: AndresAlgaba

src/pytorch_lightning/CHANGELOG.md

@@ -221,6 +221,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 - Removed the deprecated `Trainer.use_amp` and `LightningModule.use_amp` attributes ([#14832](https://github.com/Lightning-AI/lightning/pull/14832))
 
+- Removed the deprecated `Trainer.run_stage` in favor of `Trainer.{fit,validate,test,predict}`
+
 
 - Removed the deprecated `SimpleProfiler.profile_iterable` and `AdvancedProfiler.profile_iterable` attributes ([#14864](https://github.com/Lightning-AI/lightning/pull/14864))
 

src/pytorch_lightning/trainer/trainer.py

@@ -1133,13 +1133,6 @@ def _teardown(self):
         self._logger_connector.teardown()
         self._signal_connector.teardown()
 
-    def run_stage(self) -> None:
-        rank_zero_deprecation(
-            "`Trainer.run_stage` is deprecated in v1.6 and will be removed in v1.8. Use"
-            " `Trainer.{fit,validate,test,predict}` instead."
-        )
-        return self._run_stage()
-
     def _run_stage(self):
         self.strategy.barrier("run-stage")
         self.strategy.dispatch(self)

tests/tests_pytorch/deprecated_api/test_remove_1-8.py

@@ -65,13 +65,6 @@ def test_v1_8_0_deprecated_call_hook():
         trainer.call_hook("test_hook")
 
 
-def test_v1_8_0_deprecated_run_stage():
-    trainer = Trainer()
-    trainer._run_stage = Mock()
-    with pytest.deprecated_call(match="`Trainer.run_stage` is deprecated in v1.6 and will be removed in v1.8."):
-        trainer.run_stage()
-
-
 def test_v1_8_0_trainer_verbose_evaluate():
     trainer = Trainer()
     with pytest.deprecated_call(match="verbose_evaluate` property has been deprecated and will be removed in v1.8"):