class_docstr: A stub TokenIndexer that returns multiple arrays of different lengths.
class_docstr_tok: ["A","stub","TokenIndexer","that","returns","multiple","arrays","of","different","lengths","."]
code: def get_padding_token(self):
      return 0
  
imports: from __future__ import with_statement
  from __future__ import absolute_import
  from __future__ import print_function
  from collections import defaultdict
  import pytest
  import numpy
  from allennlp.data import Token, Vocabulary
  from allennlp.data.fields import TextField
  from allennlp.data.token_indexers import SingleIdTokenIndexer, TokenCharactersIndexer, TokenIndexer
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.common.checks import ConfigurationError
  from allennlp.common.util import pad_sequence_to_length
label_desc: Use image node_id 3 for calling the DictReturningTokenIndexer obj's underlying member method code with example usage: obj.get_padding_token() and returns: int