code: def test_input_reduction(self):
      # test using classification model
      inputs = {"sentence": "I always write unit tests for my code."}
  
      archive = load_archive(
          self.FIXTURES_ROOT
          / "basic_classifier"
          / "serialization"
          / "model.tar.gz"
      )
      predictor = Predictor.from_archive(archive)
  
      reducer = InputReduction(predictor)
      reduced = reducer.attack_from_json(
          inputs, "tokens", "grad_input_1"
      )
      assert reduced is not None
      assert "final" in reduced
      assert "original" in reduced
      assert reduced["final"][0]  # always at least one token
      assert len(reduced["final"][0]) <= len(
          reduced["original"]
      )  # input reduction removes tokens
      for word in reduced["final"][0]:  # no new words entered
          assert word in reduced["original"]
  
      # test using NER model (tests different underlying logic)
      inputs = {"sentence": "Eric Wallace was an intern at AI2"}
  
      archive = load_archive(
          self.FIXTURES_ROOT
          / "simple_tagger"
          / "serialization"
          / "model.tar.gz"
      )
      predictor = Predictor.from_archive(archive, "sentence_tagger")
  
      reducer = InputReduction(predictor)
      reduced = reducer.attack_from_json(
          inputs, "tokens", "grad_input_1"
      )
      assert reduced is not None
      assert "final" in reduced
      assert "original" in reduced
      for reduced_input in reduced["final"]:
          assert reduced_input  # always at least one token
          assert len(reduced_input) <= len(
              reduced["original"]
          )  # input reduction removes tokens
          for word in reduced_input:  # no new words entered
              assert word in reduced["original"]
  
imports: from allennlp.common.testing import AllenNlpTestCase
  from allennlp.models.archival import load_archive
  from allennlp.predictors import Predictor
  from allennlp.interpret.attackers import InputReduction
label_desc: Use image node_id 1 for calling the TestInputReduction obj's underlying member method code with example usage: obj.test_input_reduction() without return types