class_docstr: An observer that collects action norm stats.
docstr: Returns metrics collected for the current episode.
code: def get_metrics(self) -> Dict[str, base.Number]:
      """Returns metrics collected for the current episode."""
      return {
          "action_norm_avg": np.mean(self._action_norms),
          "action_norm_min": np.min(self._action_norms),
          "action_norm_max": np.max(self._action_norms),
      }
  
file_path: acme/acme/utils/observers/action_norm.py
imports: from typing import Dict
  from acme.utils.observers import base
  import dm_env
  import numpy
label_desc: Use image node_id 4 for calling the ActionNormObserver obj's underlying member method code with example usage: obj.get_metrics() and returns: dict