code: def test_not_iterable(self):
      x = chainer.Variable(numpy.zeros((4, 2, 3), numpy.float32))
      t = chainer.Variable(numpy.zeros((2, 2), numpy.int32))
      with self.assertRaises(ValueError):
          functions.connectionist_temporal_classification(
              tuple(x), t, 0, reduce="invalid_option"
          )
  
imports: import math
  import unittest
  import numpy
  import chainer
  from chainer import backend
  from chainer.backends import cuda
  from chainer import functions
  from chainer import gradient_check
  from chainer import testing
  from chainer.testing import attr
  from chainer.testing import condition
label_desc: Use image node_id 1 for calling the TestCTCInvalidReductionOption obj's underlying member method code with example usage: obj.test_not_iterable() without return types