code: def is_finished(self):
      return self.action_history[0][-1] == 4
  
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 2 for calling the SimpleDecoderState obj's underlying member method code with example usage: obj.is_finished() and returns: unknown