text: # 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 os import environ
  
  from pytorch_lightning.loggers.base import LightningLoggerBase, LoggerCollection
  from pytorch_lightning.loggers.csv_logs import CSVLogger
  from pytorch_lightning.loggers.tensorboard import TensorBoardLogger
  
  __all__ = [
      'LightningLoggerBase',
      'LoggerCollection',
      'TensorBoardLogger',
      'CSVLogger',
  ]
  
  try:
      # needed to prevent ImportError and duplicated logs.
      environ["COMET_DISABLE_AUTO_LOGGING"] = "1"
  
      from pytorch_lightning.loggers.comet import CometLogger
  except ImportError:  # pragma: no-cover
      del environ["COMET_DISABLE_AUTO_LOGGING"]  # pragma: no-cover
  else:
      __all__.append('CometLogger')
  
  try:
      from pytorch_lightning.loggers.mlflow import MLFlowLogger
  except ImportError:  # pragma: no-cover
      pass  # pragma: no-cover
  else:
      __all__.append('MLFlowLogger')
  
  try:
      from pytorch_lightning.loggers.neptune import NeptuneLogger
  except ImportError:  # pragma: no-cover
      pass  # pragma: no-cover
  else:
      __all__.append('NeptuneLogger')
  
  try:
      from pytorch_lightning.loggers.test_tube import TestTubeLogger
  except ImportError:  # pragma: no-cover
      pass  # pragma: no-cover
  else:
      __all__.append('TestTubeLogger')
  
  try:
      from pytorch_lightning.loggers.wandb import WandbLogger
  except ImportError:  # pragma: no-cover
      pass  # pragma: no-cover
  else:
      __all__.append('WandbLogger')
  