class_docstr: Base class for transferring styles problems
class_docstr_tok: ["Base","class","for","transferring","styles","problems"]
code: def dataset_url(self, dataset_split):
      train = dataset_split == problem.DatasetSplit.TRAIN
      if train:
          return _SHAKESPEARE_MODERN_TRAIN_DATASET
      return _SHAKESPEARE_MODERN_DEV_DATASET
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import tarfile
  from tensor2tensor.data_generators import generator_utils
  from tensor2tensor.data_generators import problem
  from tensor2tensor.data_generators import text_problems
  from tensor2tensor.utils import registry
label_desc: Use image node_id 3 for calling the StyleTransferProblemShakespeare obj's underlying member method code with example usage: obj.dataset_url(dataset_split) and returns: _SHAKESPEARE_MODERN_DEV_DATASET, _SHAKESPEARE_MODERN_TRAIN_DATASET