code: def test_forward_backward_without_mf(self):
      model = NeuralCF(30, 30, 2, include_mf=False)
      input_data = np.random.randint(1, 30, size=(10, 2))
      self.assert_forward_backward(model, input_data)
  
file_path: analytics-zoo/pyzoo/test/zoo/models/recommendation/test_neuralcf.py
imports: import pytest
  import random
  from zoo.pipeline.api.keras.layers import *
  from zoo.models.recommendation import UserItemFeature
  from zoo.models.recommendation import NeuralCF
  from test.zoo.pipeline.utils.test_utils import ZooTestCase
label_desc: Use image node_id 1 for calling the TestNeuralCF obj's underlying member method code with example usage: obj.test_forward_backward_without_mf() without return types