code: def testConvertToLayoutRulesGenericInputs(self):
      with self.assertRaises(ValueError):
          mtf.convert_to_layout_rules("d_ff;heads")
  
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 MeshTensorFlowTest obj's underlying member method code with example usage: obj.testConvertToLayoutRulesGenericInputs() without return types