text: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  
  from .cnn_encoder import CNNEncoder
  from .pcnn_encoder import PCNNEncoder
  from .rnn_encoder import RNNEncoder
  from .bert_encoder import BERTEncoder, BERTEntityEncoder
  
  __all__ = [
      'CNNEncoder',
      'PCNNEncoder',
      'BERTEncoder',
      'BERTEntityEncoder'
  ]