code: def test_pmap(self):
      def my_function(x):
          return x
  
      n = jax.local_device_count()
      graph, _, _ = dot.to_graph(jax.pmap(my_function))(jnp.ones([n]))
      self.assertEmpty(graph.nodes)
      self.assertEmpty(graph.edges)
      (jit,) = graph.subgraphs
      self.assertEqual(jit.title, "xla_pmap (my_function)")
  
imports: from absl.testing import absltest
  from absl.testing import parameterized
  from haiku._src import dot
  from haiku._src import module
  from haiku._src import test_utils
  import jax
  import jax.numpy
label_desc: Use image node_id 5 for calling the DotTest obj's underlying member method code with example usage: obj.test_pmap() and returns: x