code: def testGenerateAssignments(self):
      splittable_dims = {"s1", "s2", "s3"}
      mesh_dims = {"m1": 4, "m2": 8}
  
      assignments = layout_optimizer._generate_assignments(
          splittable_dims, mesh_dims
      )
      # Check that some valid assignments of various sizes are included
      self.assertIn({}, assignments)
      self.assertIn({"s3": "m2"}, assignments)
      self.assertIn({"s1": "m2", "s2": "m1"}, assignments)
      # Not allowed to map two splittable dimensions to the same mesh dimension.
      self.assertNotIn({"s1": "m2", "s3": "m2"}, assignments)
      # Check the total number of assignments returned. We are looking for
      # thirteen because one assignment has no entries, six assignments have one
      # entry, and six assignments have two entries.
      self.assertLen(assignments, 13)
  
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 AssignmentsTest obj's underlying member method code with example usage: obj.testGenerateAssignments() without return types