code: def setUp(self):
      super(TestProductionRuleField, self).setUp()
      self.vocab = Vocabulary()
      self.s_rule_index = self.vocab.add_token_to_namespace(
          "S -> [NP, VP]", namespace="rule_labels"
      )
      self.np_index = self.vocab.add_token_to_namespace(
          "NP -> test", namespace="rule_labels"
      )
  
file_path: magnitude/pymagnitude/third_party/allennlp/tests/data/fields/production_rule_field_test.py
imports: from __future__ import absolute_import
  from collections import defaultdict
  from numpy.testing import assert_almost_equal
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.data import Vocabulary
  from allennlp.data.fields import ListField, ProductionRuleField
label_desc: Use image node_id 1 for calling the TestProductionRuleField obj's underlying member method code with example usage: obj.setUp() without return types