code: def training_step(self, batch, batch_idx):
      return self(batch)
  
imports: import os.path
  from typing import Any, Dict, Union
  import pytest
  import pytorch_lightning
  import torch
  from omegaconf import DictConfig, OmegaConf
  from pytorch_lightning import Callback, Trainer
  from pytorch_lightning.utilities.exceptions import MisconfigurationException
  from pytorch_lightning.utilities.types import STEP_OUTPUT
  from nemo.collections.common.callbacks import EMA
  from nemo.collections.common.callbacks.ema import EMAOptimizer
  from nemo.core import ModelPT
  from nemo.utils.exp_manager import exp_manager
label_desc: Use image node_id 6 for calling the ExampleModel obj's underlying member method code with example usage: obj.training_step(batch, batch_idx) and returns: self