code: def _iteration(self, engine, batchdata):
      return batchdata
  
imports: from __future__ import annotations
  import os
  import unittest
  import numpy
  import torch
  from ignite.engine import Engine
  from parameterized import parameterized
  from monai.data import DataLoader, Dataset, MetaTensor
  from monai.engines import Evaluator
  from monai.handlers import ProbMapProducer, ValidationHandler
  from monai.utils.enums import ProbMapKeys
label_desc: Use image node_id 1 for calling the TestEvaluator obj's underlying member method code with example usage: obj._iteration(engine, batchdata) and returns: batchdata