def METHOD_NAME(
    policy: FeedForwardPolicy) -> ActorCore[PRNGKey, Tuple[()]]:
  """A convenience adaptor from FeedForwardPolicy to ActorCore."""
  def select_action(params: networks_lib.Params,
                    observation: networks_lib.Observation,
                    state: PRNGKey):
    rng = state
    rng1, rng2 = jax.random.split(rng)
    observation = utils.add_batch_dim(observation)
    action = utils.squeeze_batch_dim(policy(params, rng1, observation))
    return action, rng2
  def init(rng: PRNGKey) -> PRNGKey:
    return rng
  def get_extras(unused_rng: PRNGKey) -> Tuple[()]:
    return ()
  return ActorCore(init=init, select_action=select_action,
                   get_extras=get_extras)