Remove the deprecated code in `pl.utilities.optimizer` (#16439)

docs/source-pytorch/api_references.rst

@@ -319,7 +319,6 @@ utilities
     finite_checks
     memory
     model_summary
-    optimizer
     parsing
     rank_zero
     seed

src/pytorch_lightning/CHANGELOG.md

@@ -79,6 +79,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 - Removed the deprecated code in `pl.utilities.device_parser` ([#16412](https://github.com/Lightning-AI/lightning/pull/16412))
 
+- Removed the deprecated code in `pl.utilities.optimizer` ([#16439](https://github.com/Lightning-AI/lightning/pull/16439))
+
 - Removed the deprecated code in `pl.utilities.seed` ([#16422](https://github.com/Lightning-AI/lightning/pull/16422))
 
 - Removed the deprecated code in `pl.utilities.cloud_io` ([#16438](https://github.com/Lightning-AI/lightning/pull/16438))

src/pytorch_lightning/utilities/optimizer.py

@@ -1,35 +0,0 @@
-# Copyright The PyTorch Lightning team.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-from typing import Any
-
-from lightning_fabric.utilities.optimizer import _optimizer_to_device as new_optimizer_to_device
-from lightning_fabric.utilities.optimizer import _optimizers_to_device as new_optimizers_to_device
-from pytorch_lightning.utilities.rank_zero import rank_zero_deprecation
-
-
-def optimizers_to_device(*args: Any, **kwargs: Any) -> None:
-    rank_zero_deprecation(
-        "`pytorch_lightning.utilities.optimizer.optimizers_to_device` has been deprecated in v1.8.0 and will be"
-        " removed in v2.0.0. This function is internal but you can copy over its implementation."
-    )
-    return new_optimizers_to_device(*args, **kwargs)
-
-
-def optimizer_to_device(*args: Any, **kwargs: Any) -> None:
-    rank_zero_deprecation(
-        "`pytorch_lightning.utilities.optimizer.optimizer_to_device` has been deprecated in v1.8.0 and will be"
-        " removed in v2.0.0. This function is internal but you can copy over its implementation."
-    )
-    return new_optimizer_to_device(*args, **kwargs)

tests/tests_pytorch/deprecated_api/test_remove_2-0.py

@@ -13,12 +13,10 @@
 # limitations under the License.
 """Test deprecated functionality which will be removed in v2.0.0."""
 import pytest
-import torch
 from torch.utils.data import DataLoader
 
 from pytorch_lightning.demos.boring_classes import RandomDataset
 from pytorch_lightning.utilities.data import has_iterable_dataset, has_len
-from pytorch_lightning.utilities.optimizer import optimizer_to_device, optimizers_to_device
 
 
 def test_v1_10_deprecated_data_utilities():
@@ -27,11 +25,3 @@ def test_v1_10_deprecated_data_utilities():
 
     with pytest.deprecated_call(match="data.has_len` has been deprecated in v1.8.0"):
         has_len(DataLoader(RandomDataset(2, 4)))
-
-
-def test_v1_10_deprecated_optimizer_utilities():
-    with pytest.deprecated_call(match="optimizer.optimizers_to_device` has been deprecated in v1.8.0"):
-        optimizers_to_device([torch.optim.Adam(torch.nn.Linear(1, 1).parameters())], "cpu")
-
-    with pytest.deprecated_call(match="optimizer.optimizer_to_device` has been deprecated in v1.8.0"):
-        optimizer_to_device(torch.optim.Adam(torch.nn.Linear(1, 1).parameters()), "cpu")