code: def test_list_field_can_handle_empty_sequence_label_fields(self):
      list_field = ListField(
          [
              self.sequence_label_field,
              self.sequence_label_field,
              self.empty_sequence_label_field,
          ]
      )
      list_field.index(self.vocab)
      tensor = list_field.as_tensor(list_field.get_padding_lengths())
      numpy.testing.assert_array_equal(
          tensor.detach().cpu().numpy(),
          numpy.array([[1, 1, 0, 1], [1, 1, 0, 1], [0, 0, 0, 0]]),
      )
  
imports: from typing import Dict
  import numpy
  import torch
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.data import Token, Vocabulary, Instance
  from allennlp.data.fields import TextField, LabelField, ListField, IndexField, SequenceLabelField
  from allennlp.data.token_indexers import SingleIdTokenIndexer, TokenCharactersIndexer
  from allennlp.data.data_loaders import SimpleDataLoader
  from allennlp.data.tokenizers import SpacyTokenizer
  from allennlp.models import Model
  from allennlp.modules import Embedding
  from allennlp.modules.text_field_embedders import BasicTextFieldEmbedder
label_desc: Use image node_id 5 for calling the TestListField obj's underlying member method code with example usage: obj.test_list_field_can_handle_empty_sequence_label_fields() without return types