old_contents: # 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 pytorch_lightning.utilities.distributed import rank_zero_warn
  
  
  class WarningCache:
  
      def __init__(self):
          self.warnings = set()
  
      def warn(self, m, *args, **kwargs):
          if m not in self.warnings:
              self.warnings.add(m)
              rank_zero_warn(m, *args, **kwargs)
  
      def clear(self):
          self.warnings.clear()
  
new_contents: # 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 pytorch_lightning.utilities.distributed import rank_zero_warn
  
  
  class WarningCache(set):
  
      def warn(self, m, *args, **kwargs):
          if m not in self:
              self.add(m)
              rank_zero_warn(m, *args, **kwargs)
  
subject: Change `WarningCache` to subclass `set` (#7995)