code: def save_model(self, model):
      model_dir = self.create_tempdir().full_path
      model.save(model_dir)
      return model_dir
  
imports: import os
  import shutil
  from absl.testing import parameterized
  import tensorflow
  from tensorflow_model_optimization.python.core.common.keras.compression.algorithms import epr
label_desc: Use image node_id 2 for calling the EPRTest obj's underlying member method code with example usage: obj.save_model(model) and returns: model_dir