code: def input_layer(self, input_data):
      from lasagne.layers.input import InputLayer
  
      shape = list(input_data.shape)
      shape[0] = None
      return InputLayer(shape)
  
imports: from mock import Mock
  import numpy
  import pytest
  import theano
label_desc: Use image node_id 3 for calling the TestLocalResponseNormalization2DLayer obj's underlying member method code with example usage: obj.input_layer(input_data) and returns: InputLayer