code: def save_model(self):
      exp_model = self.model.export_model()
      logger.info(f"model type: {type(exp_model)}")
      try:
          exp_model.save("model", save_format="tf")
          return True
      except Exception:
          exp_model.save(f"model.h5")
  
file_path: igel/igel/auto/cnn.py
imports: import json
  import logging
  import os
  import autokeras
  from igel.auto.defaults import Defaults
  from igel.auto.models import Models
  from igel.constants import Constants
  from igel.utils import read_json, read_yaml
  from tensorflow.keras.models import load_model
label_desc: Use image node_id 4 for calling the IgelCNN obj's underlying member method code with example usage: obj.save_model() and returns: True