code: def test_padding_lengths_are_computed_correctly(self):
      # pylint: disable=protected-access
      self.field.index(self.vocab)
      assert self.field.get_padding_lengths() == {
          "num_entities": 9,
          "num_entity_tokens": 3,
          "num_utterance_tokens": 4,
      }
      self.field._token_indexers[
          "token_characters"
      ] = TokenCharactersIndexer()
      self.field.index(self.vocab)
      assert self.field.get_padding_lengths() == {
          "num_entities": 9,
          "num_entity_tokens": 3,
          "num_utterance_tokens": 4,
          "num_token_characters": 9,
      }
  
imports: from __future__ import division
  from __future__ import with_statement
  from __future__ import absolute_import
  from collections import defaultdict
  import pytest
  from numpy.testing import assert_almost_equal
  import torch
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.data import Vocabulary
  from allennlp.data.fields import KnowledgeGraphField
  from allennlp.data.token_indexers import SingleIdTokenIndexer, TokenCharactersIndexer
  from allennlp.data.tokenizers import WordTokenizer
  from allennlp.data.tokenizers.word_splitter import SpacyWordSplitter
  from allennlp.semparse.contexts import TableQuestionKnowledgeGraph
label_desc: Use image node_id 5 for calling the KnowledgeGraphFieldTest obj's underlying member method code with example usage: obj.test_padding_lengths_are_computed_correctly() without return types