code: def testInvalid(self):
      r = np.random.RandomState(0)
      cases = [
          # incorrect rank.
          ("ij,jk->ik", r.randn(1, 2, 3), r.randn(3, 4)),
          ("...ij,jk->ik", r.randn(3), r.randn(3, 4)),
          # inconsistent dimensions.
          ("ij,jk->ik", r.randn(2, 3), r.randn(4, 4)),
          # broadcasting is invalid
          ("...ij,...jk->...ik", r.randn(5, 2, 3), r.randn(7, 3, 4)),
          # output should have ellipsis when broadcasting shape is
          # non-empty.
          ("...ij,...jk->ik", r.randn(2, 2, 3), r.randn(3, 4)),
      ]
      for args in cases:
          with self.subTest(args=args):
              with self.assertRaises(
                  (ValueError, errors.InvalidArgumentError)
              ):
                  _ = self.evaluate(
                      gen_linalg_ops.einsum(args[1:], args[0])
                  )
  
              placeholders = [
                  array_ops.placeholder_with_default(x, shape=None)
                  for x in args[1:]
              ]
              with self.assertRaises(
                  (ValueError, errors.InvalidArgumentError)
              ):
                  _ = self.evaluate(
                      gen_linalg_ops.einsum(placeholders, args[0])
                  )
  
imports: import numpy
  from tensorflow.python.client import session
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import gen_linalg_ops
  from tensorflow.python.ops import gradient_checker_v2
  from tensorflow.python.ops import special_math_ops
  from tensorflow.python.ops import variables
  from tensorflow.python.platform import benchmark
  from tensorflow.python.platform import test
label_desc: Use image node_id 12 for calling the EinsumOpTest obj's underlying member method code with example usage: obj.testInvalid() without return types