code: def check_invalid_option(self, cost_data, xs_data, ys_data):
      with self.assertRaises(ValueError):
          functions.crf1d(cost_data, xs_data, ys_data, "invalid_option")
  
imports: import itertools
  import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer import functions
  from chainer import gradient_check
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 12 for calling the TestCRF1d obj's underlying member method code with example usage: obj.check_invalid_option(cost_data, xs_data, ys_data) without return types