Lite: Remove legacy code (#15953)

Author: awaelchli

src/lightning_fabric/wrappers.py

@@ -82,7 +82,7 @@ def __init__(
             forward_module: The module to wrap the ``forward`` method on.
             precision: Reference to the precision plugin for handling precision context
             original_module: The original, unmodified module as passed into the
-                :meth:`pytorch_lightning.lite.lite.Fabric.setup` method. This is needed when attribute lookup
+                :meth:`lightning_fabric.fabric.Fabric.setup` method. This is needed when attribute lookup
                 on this wrapper should pass through to the original module.
         """
         super().__init__()

src/pytorch_lightning/lite/__init__.py

@@ -9,7 +9,6 @@
     from pytorch_lightning import LightningDataModule, LightningModule, Trainer
     from pytorch_lightning.accelerators.accelerator import Accelerator
     from pytorch_lightning.callbacks import Callback
-    from pytorch_lightning.lite import LightningLite
     from pytorch_lightning.loggers import LightningLoggerBase
     from pytorch_lightning.loops.base import Loop
     from pytorch_lightning.plugins import PrecisionPlugin
@@ -48,8 +47,5 @@ class BoringLoop(Loop):
     class BoringMetric(Metric):
         pass
 
-    class BoringLightningLite(LightningLite):
-        pass
-
     class BoringBaseProfiler(BaseProfiler):
         pass

src/pytorch_lightning/lite/lite.py

@@ -41,7 +41,6 @@ def test_introspection_lightning():
 def test_introspection_lightning_overrides():
     """This test validates the scanner can find all the subclasses from primitives classes from PyTorch Lightning
     in the provided files."""
-    scanner = Scanner(str(os.path.join(_PROJECT_ROOT, "tests/tests_app/core/scripts/lightning_cli.py")))
     scanner = Scanner(str(os.path.join(_PROJECT_ROOT, "tests/tests_app/core/scripts/lightning_overrides.py")))
     scan = scanner.scan()
     assert sorted(scan.keys()) == [