code: def mock_model():
      def mock_predict(*args, is_list=False):
          """Mock model predict method"""
          if is_list:
              return [0] * DATA_SIZE
          else:
              return 0
  
      mock_model = Mock()
      mock_model.predict.side_effect = mock_predict
      return mock_model
  
imports: import pytest
  from unittest.mock import Mock
  from recommenders.tuning.nni.ncf_utils import compute_test_results
  from recommenders.datasets.movielens import MockMovielensSchema
label_desc: Use image node_id 1 for calling a global function with example usage: mock_model() and returns: mock_model, unknown, int