code: def get_dtype(opt):
      return DatatypeHelper.fold(opt["datatype"])
  
imports: import os
  import json
  from copy import deepcopy
  from parlai.core.message import Message
  from parlai.utils.data import DatatypeHelper
  from parlai.core.teachers import ChunkTeacher
  from .build import build
label_desc: Use image node_id 1 for calling a global function with example usage: get_dtype(opt) and returns: DatatypeHelper