code: def input_layer(self, request):
      from lasagne.layers.input import InputLayer
  
      return InputLayer(request.param)
  
imports: from mock import Mock
  import numpy
  import numpy
  from numpy.random import RandomState
  import theano
  import pytest
  from lasagne.random import get_rng, set_rng
label_desc: Use image node_id 2 for calling the TestGaussianNoiseLayer obj's underlying member method code with example usage: obj.input_layer(request) and returns: InputLayer