text: # Copyright 2020-2021 Huawei Technologies Co., Ltd
  #
  # 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.
  # ============================================================================
  """Source of mass model."""
  from .dataset import load_dataset
  from .dataset import bi_data_loader
  from .dataset import mono_data_loader
  from .transformer import TransformerDecoder
  from .transformer import TransformerEncoder
  from .transformer import Transformer
  from .transformer import TransformerNetworkWithLoss
  from .transformer import LabelSmoothedCrossEntropyCriterion
  from .transformer import TransformerTrainOneStepWithLossScaleCell
  from .transformer import TransformerTraining
  from .transformer import infer
  from .transformer import TransformerInferModel
  from .language_model import LooseMaskedLanguageModel
  from .language_model import MaskedLanguageModel
  from .language_model import NoiseChannelLanguageModel
  
  __all__ = [
      "load_dataset",
      "bi_data_loader",
      "mono_data_loader",
      "Transformer",
      "infer",
      "TransformerTraining",
      "TransformerNetworkWithLoss",
      "TransformerTrainOneStepWithLossScaleCell",
      "LabelSmoothedCrossEntropyCriterion",
      "LooseMaskedLanguageModel",
      "MaskedLanguageModel",
      "TransformerInferModel",
      "NoiseChannelLanguageModel"
  ]
  