code: def setup_method(self):
      super().setup_method()
      self.instances = SequenceTaggingDatasetReader().read(
          self.FIXTURES_ROOT / "data" / "sequence_tagging.tsv"
      )
      vocab = Vocabulary.from_instances(self.instances)
      self.vocab = vocab
      self.model = ConstantModel(vocab)
  
file_path: allennlp/tests/training/no_op_trainer_test.py
imports: import os
  from typing import Dict
  import torch
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.data import Vocabulary
  from allennlp.data.dataset_readers import SequenceTaggingDatasetReader
  from allennlp.models.model import Model
  from allennlp.training import NoOpTrainer
label_desc: Use image node_id 1 for calling the TestNoOpTrainer obj's underlying member method code with example usage: obj.setup_method() without return types