code: def setUp(self):
      super(OptimizeLayoutTest, self).setUp()
      self.mtf_graph = mtf.Graph()
      self.mesh = mtf.Mesh(self.mtf_graph, "my_mesh")
      self.mesh_shape = mtf.convert_to_shape("m1:4,m2:2")
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import mesh_tensorflow
  from mesh_tensorflow.auto_mtf import layout_optimizer
  from mesh_tensorflow.auto_mtf import memory_estimator
  import six
  import tensorflow.compat.v1
label_desc: Use image node_id 1 for calling the OptimizeLayoutTest obj's underlying member method code with example usage: obj.setUp() without return types