old_contents: from .language_modeling import LanguageModelingDataset, WikiText2, PennTreebank  # NOQA
  from .snli import SNLI
  from .sst import SST
  from .translation import TranslationDataset, Multi30k, IWSLT, WMT14  # NOQA
  from .sequence_tagging import SequenceTaggingDataset, UDPOS, CoNLL2000Chunking # NOQA
  from .trec import TREC
  from .imdb import IMDB
  from .babi import BABI20
  
  
  __all__ = ['LanguageModelingDataset',
             'SNLI',
             'SST',
             'TranslationDataset',
             'Multi30k',
             'IWSLT',
             'WMT14'
             'WikiText2',
             'PennTreeBank',
             'TREC',
             'IMDB',
             'SequenceTaggingDataset',
             'UDPOS',
             'CoNLL2000Chunking',
             'BABI20']
  
new_contents: from .language_modeling import LanguageModelingDataset, WikiText2, PennTreebank  # NOQA
  from .snli import SNLI
  from .sst import SST
  from .translation import TranslationDataset, Multi30k, IWSLT, WMT14  # NOQA
  from .sequence_tagging import SequenceTaggingDataset, UDPOS, CoNLL2000Chunking # NOQA
  from .trec import TREC
  from .imdb import IMDB
  from .babi import BABI20
  
  
  __all__ = ['LanguageModelingDataset',
             'SNLI',
             'SST',
             'TranslationDataset',
             'Multi30k',
             'IWSLT',
             'WMT14',
             'WikiText2',
             'PennTreeBank',
             'TREC',
             'IMDB',
             'SequenceTaggingDataset',
             'UDPOS',
             'CoNLL2000Chunking',
             'BABI20']
  
subject: Update __init__.py (#373)