code: def test_bad_ellipsis_sum(self):
      with self.assertRaises(ValueError):
          einsum.einsum(self.subscripts, *self.inputs)
  
imports: import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer.functions.math import einsum
  from chainer import gradient_check
  from chainer import testing
  from chainer.testing import attr
  from chainer import utils
label_desc: Use image node_id 2 for calling the TestEinSumUndefinedSemantics obj's underlying member method code with example usage: obj.test_bad_ellipsis_sum() without return types