code: def get_msc_dir_path(opt):
      dpath = os.path.join(opt["datapath"], "msc")
      return dpath
  
imports: import parlai.core.build_data
  import os
  from parlai.utils.logging import logger
  from parlai.core.build_data import DownloadableFile
label_desc: Use image node_id 1 for calling a global function with example usage: get_msc_dir_path(opt) and returns: dpath