code: def testBroadcastOperation(self):
      broadcast_operation = mtf.BroadcastOperation(
          self.x, mtf.Shape([self.b_dim, self.c_dim, self.a_dim])
      )
      self.assertEqual(
          broadcast_operation.splittable_dims,
          frozenset(["a", "b", "c"]),
      )
      self.assertEqual(
          broadcast_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 6 for calling the OperationSplittabilityTest obj's underlying member method code with example usage: obj.testBroadcastOperation() without return types