code: def test_creation_with_valid_none_fields(self, none_fields):
      for none_field in none_fields:
          self.graph[none_field] = None
      graph = graphs.GraphsTuple(**self.graph)
      for k, v in self.graph.items():
          self.assertEqual(v, getattr(graph, k))
  
file_path: graph_nets/graph_nets/tests/graphs_test.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl.testing import parameterized
  from graph_nets import graphs
  import tensorflow
label_desc: Use image node_id 4 for calling the GraphsTest obj's underlying member method code with example usage: obj.test_creation_with_valid_none_fields(none_fields) without return types