code: def _default_paired_text_dataset_hparams():
      """Returns hyperparameters of a paired text dataset with default values.
  
      See :meth:`texar.tf.data.PairedTextData.default_hparams` for details.
      """
      source_hparams = _default_mono_text_dataset_hparams()
      source_hparams["bos_token"] = None
      source_hparams["data_name"] = "source"
      target_hparams = _default_mono_text_dataset_hparams()
      target_hparams.update(
          {
              "vocab_share": False,
              "embedding_init_share": False,
              "processing_share": False,
              "data_name": "target",
          }
      )
      return {
          "source_dataset": source_hparams,
          "target_dataset": target_hparams,
      }
  
imports: import copy
  import tensorflow
  from texar.tf.utils import utils
  from texar.tf.utils.dtypes import is_callable
  from texar.tf.data.data.mono_text_data import _default_mono_text_dataset_hparams
  from texar.tf.data.data.text_data_base import TextDataBase
  from texar.tf.data.data.mono_text_data import MonoTextData
  from texar.tf.data.data_utils import count_file_lines
  from texar.tf.data.data import dataset_utils
  from texar.tf.data.vocabulary import Vocab, SpecialTokens
  from texar.tf.data.embedding import Embedding
label_desc: Use image node_id 1 for calling a global function with example usage: _default_paired_text_dataset_hparams() and returns: dict