code: def testImportOperation(self):
      tf_x = tf.zeros([5, 10])
      import_operation = mtf.ImportOperation(
          self.mesh, tf_x, self.ab_shape
      )
      self.assertEqual(
          import_operation.splittable_dims, frozenset(["a", "b"])
      )
      self.assertEqual(import_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 19 for calling the OperationSplittabilityTest obj's underlying member method code with example usage: obj.testImportOperation() without return types