code: def test_undefined_shape(self, ParametricRectifierLayer):
      with pytest.raises(ValueError):
          ParametricRectifierLayer(
              (None, 3, 28, 28), shared_axes=(1, 2, 3)
          )
  
imports: from mock import Mock
  import numpy
  import pytest
  import theano
  from lasagne.layers import InputLayer, standardize, get_output, get_all_params
  from lasagne.utils import floatX
label_desc: Use image node_id 4 for calling the TestParametricRectifierLayer obj's underlying member method code with example usage: obj.test_undefined_shape(ParametricRectifierLayer) without return types