code: def testSplitOperation(self):
      split_operation = mtf.SplitOperation(self.x, self.b_dim, [3, 7])
      self.assertEqual(
          split_operation.splittable_dims, frozenset(["a"])
      )
      self.assertEqual(
          split_operation.unsplittable_dims, frozenset(["b"])
      )
  
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 10 for calling the OperationSplittabilityTest obj's underlying member method code with example usage: obj.testSplitOperation() without return types