code: def dummy_input_layer():
      from lasagne.layers.input import InputLayer
  
      input_layer = InputLayer((2, 3, 4))
      mock = Mock(input_layer)
      mock.shape = input_layer.shape
      mock.input_var = input_layer.input_var
      mock.output_shape = input_layer.output_shape
      return mock
  
label_desc: Use image node_id 1 for calling a global function with example usage: dummy_input_layer() and returns: mock