code: def test_forward_backward(self):
      model = KNRM(
          15,
          60,
          glove_path,
          word_index={"is": 1, "to": 2, "the": 3, "for": 4},
          kernel_num=10,
          sigma=0.15,
          exact_sigma=1e-4,
      )
      input_data = np.random.randint(5, size=(1, 75))
      self.assert_forward_backward(model, input_data)
  
file_path: analytics-zoo/pyzoo/test/zoo/models/textmatching/test_knrm.py
imports: import os
  import pytest
  from keras.layers import *
  from keras.models import Model
  from zoo.models.textmatching import KNRM
  from test.zoo.pipeline.utils.test_utils import ZooTestCase
label_desc: Use image node_id 3 for calling the TestKNRM obj's underlying member method code with example usage: obj.test_forward_backward() without return types