class_docstr: Builds and/or loads a dictionary.
  
  All code is TorchScriptable.
class_docstr_tok: ["Builds","and\/or","loads","a","dictionary",".","All","code","is","TorchScriptable","."]
docstr: Return token from index, or unk_token.
docstr_tok: ["Return","token","from","index",",","or","unk_token","."]
code: def _index_lookup(self, key: int) -> str:
      """
      Return token from index, or unk_token.
      """
      if key in self.ind2tok:
          return self.ind2tok[key]
      else:
          return self.unk_token
  
imports: from typing import Dict, List, Tuple
  import torch.jit
label_desc: Use image node_id 3 for calling the ScriptableDictionaryAgent obj's underlying member method code with example usage: obj._index_lookup(key) and returns: self, self