code: def test_init_untie_biases(self, NINLayer, dummy_input_layer):
      layer = NINLayer(
          dummy_input_layer,
          num_units=5,
          untie_biases=True,
      )
      assert (layer.b.shape.eval() == (5, 4, 5)).all()
  
imports: from mock import Mock
  import numpy
  import pytest
  import theano
  import lasagne
label_desc: Use image node_id 7 for calling the TestNINLayer obj's underlying member method code with example usage: obj.test_init_untie_biases(NINLayer, dummy_input_layer) without return types