code: def layer(self, input_layer):
      from lasagne.layers.normalization import (
          LocalResponseNormalization2DLayer,
      )
  
      layer = LocalResponseNormalization2DLayer(
          input_layer, alpha=1.5, k=2, beta=0.75, n=5
      )
      return layer
  
imports: from mock import Mock
  import numpy
  import pytest
  import theano
label_desc: Use image node_id 4 for calling the TestLocalResponseNormalization2DLayer obj's underlying member method code with example usage: obj.layer(input_layer) and returns: layer