code: def test_invalid_initialW_ndarray(self):
      invalid_dim = 1
      initialW = numpy.random.uniform(
          -1,
          1,
          (self.out_size, self.pool_size, self.in_size, invalid_dim),
      ).astype(numpy.float32)
      with self.assertRaises(ValueError):
          links.Maxout(
              self.in_size,
              self.out_size,
              self.pool_size,
              initialW=initialW,
          )
  
imports: import unittest
  import numpy
  import six
  import chainer
  from chainer.backends import cuda
  from chainer import gradient_check
  from chainer.initializers import constant
  from chainer import links
  from chainer import testing
  from chainer.testing import attr
  from chainer.testing import condition
  from chainer.utils import type_check
label_desc: Use image node_id 2 for calling the TestInvalidInitialization obj's underlying member method code with example usage: obj.test_invalid_initialW_ndarray() without return types