class_docstr: Wraps a learner ignoring the step calls, i.e. freezing it.
docstr: See base class.
code: def step(self):
      """See base class."""
      if self._step_fn:
          self._step_fn()
  
file_path: acme/acme/utils/frozen_learner.py
imports: from typing import Callable, List, Optional, Sequence
  import acme
label_desc: Use image node_id 2 for calling the FrozenLearner obj's underlying member method code with example usage: obj.step() without return types