code: def testEinsumOperation(self):
      x2 = mtf.zeros(self.mesh, mtf.Shape([self.a_dim, self.c_dim]))
      einsum_operation = mtf.EinsumOperation(
          [self.x, x2], mtf.Shape([self.b_dim, self.c_dim])
      )
      self.assertEqual(
          einsum_operation.splittable_dims, frozenset(["a", "b", "c"])
      )
      self.assertEqual(einsum_operation.unsplittable_dims, frozenset())
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl.testing import parameterized
  import mesh_tensorflow
  from mesh_tensorflow import test_utils
  import numpy
  import tensorflow.compat.v1
  from tensorflow.python.framework import test_util
label_desc: Use image node_id 13 for calling the OperationSplittabilityTest obj's underlying member method code with example usage: obj.testEinsumOperation() without return types