class_docstr: RND learner.
class_docstr_tok: ["RND","learner","."]
code: def step(self):
      self._direct_rl_learner.step()
  
imports: import functools
  import time
  from typing import Any, Callable, Dict, Iterator, List, NamedTuple, Optional, Tuple
  import acme
  from acme import types
  from acme.agents.jax.rnd import networks
  from acme.jax import networks
  from acme.jax import utils
  from acme.utils import counting
  from acme.utils import loggers
  from acme.utils import reverb_utils
  import jax
  import jax.numpy
  import optax
  import reverb
label_desc: Use image node_id 3 for calling the RNDLearner obj's underlying member method code with example usage: obj.step() without return types