docstr: Tests that fields are mapped parallelaly, not sequentially.
docstr_tok: ["Tests","that","fields","are","mapped","parallelaly",",","not","sequentially","."]
code: def test_map_field_is_parallel(self):
      """Tests that fields are mapped parallelaly, not sequentially."""
      graph = graphs.GraphsTuple(**self.graph)
      graph = graph.map(
          lambda v: None, ["edges", "receivers", "senders"]
      )
  
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 9 for calling the GraphsTest obj's underlying member method code with example usage: obj.test_map_field_is_parallel() without return types