Lite: Remove legacy code (#15953)

Author: awaelchli

src/pytorch_lightning/CHANGELOG.md

@@ -5,6 +5,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 
+## [fabricLaunchPLVersion] - 202Y-MM-DD
+
+### Removed
+
+- Removed the `pytorch_lightning.lite` module in favor of `lightning_fabric` ([#15953](https://github.com/Lightning-AI/lightning/pull/15953))
+
+
 ## [unreleased] - 202Y-MM-DD
 
 ### Added

src/pytorch_lightning/lite/__init__.py

@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 """Test deprecated functionality which will be removed in v1.10.0."""
-from re import escape
 from unittest import mock
 
 import numpy
@@ -30,7 +29,6 @@
 from pytorch_lightning.cli import LightningCLI
 from pytorch_lightning.core.mixins.device_dtype_mixin import DeviceDtypeModuleMixin
 from pytorch_lightning.demos.boring_classes import BoringModel, RandomDataset
-from pytorch_lightning.lite import LightningLite
 from pytorch_lightning.overrides import LightningDistributedModule, LightningParallelModule
 from pytorch_lightning.overrides.base import unwrap_lightning_module
 from pytorch_lightning.overrides.fairscale import LightningShardedDataParallel, unwrap_lightning_module_sharded
@@ -269,26 +267,6 @@ def test_v1_10_deprecated_accelerator_setup_environment_method():
         CPUAccelerator().setup_environment(torch.device("cpu"))
 
 
-class EmptyLite(LightningLite):
-    def run(self):
-        pass
-
-
-def test_lite_convert_deprecated_gpus_argument(cuda_count_2):
-    with pytest.deprecated_call(match=escape("Setting `Lite(gpus=2)` is deprecated in v1.8.0")):
-        lite = EmptyLite(gpus=2)
-    assert isinstance(lite._accelerator, LiteCUDAAccelerator)
-    assert lite._connector._parallel_devices == [torch.device("cuda", 0), torch.device("cuda", 1)]
-
-
-@RunIf(skip_windows=True)
-def test_lite_convert_deprecated_tpus_argument(tpu_available):
-    with pytest.deprecated_call(match=escape("Setting `Lite(tpu_cores=8)` is deprecated in v1.8.0")):
-        lite = EmptyLite(tpu_cores=8)
-    assert isinstance(lite._accelerator, LiteTPUAccelerator)
-    assert lite._connector._parallel_devices == list(range(8))
-
-
 @pytest.mark.parametrize(
     ["name", "value"],
     [("save_config_filename", "config.yaml"), ("save_config_overwrite", False), ("save_config_multifile", False)],