class_docstr: This :class:`TokenIndexer` represents tokens by their part of speech tag, as determined by
  the ``pos_`` or ``tag_`` fields on ``Token`` (corresponding to spacy's coarse-grained and
  fine-grained POS tags, respectively).
  
  Parameters
  ----------
  namespace : ``str``, optional (default=``pos_tags``)
      We will use this namespace in the :class:`Vocabulary` to map strings to indices.
  coarse_tags : ``bool``, optional (default=``False``)
      If ``True``, we will use coarse POS tags instead of the default fine-grained POS tags.
code: def get_padding_token(self):
      return 0
  
file_path: magnitude/pymagnitude/third_party/allennlp/data/token_indexers/pos_tag_indexer.py
imports: from __future__ import absolute_import
  import logging
  from allennlp.common.util import pad_sequence_to_length
  from allennlp.data.vocabulary import Vocabulary
  from allennlp.data.tokenizers.token import Token
  from allennlp.data.token_indexers.token_indexer import TokenIndexer
label_desc: Use image node_id 4 for calling the PosTagIndexer obj's underlying member method code with example usage: obj.get_padding_token() and returns: int