code: def __repr__(self):
      return "{self.action_history}"
  
file_path: magnitude/pymagnitude/third_party/allennlp/tests/nn/decoding/simple_transition_system.py
imports: from __future__ import absolute_import
  from collections import defaultdict
  import torch
  from allennlp.nn.decoding import DecoderState, DecoderStep
label_desc: Use image node_id 4 for calling the SimpleDecoderState obj's underlying member method code with example usage: obj.__repr__() and returns: str