code: def setup_method(self):
      self.evaluator = Evaluator.from_params(
          Params({"batch_postprocessor": "simple"})
      )
  
imports: from typing import Iterator, List, Dict
  import torch
  import pytest
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.data.data_loaders import TensorDict
  from allennlp.models import Model
  from allennlp.evaluation import Evaluator
  from allennlp.common import Params
label_desc: Use image node_id 1 for calling the TestEvaluator obj's underlying member method code with example usage: obj.setup_method() without return types