class_docstr: data reader for video input
code: def get_config_from_sec(self, sec, item, default=None):
      if sec.upper() not in self.cfg:
          return default
      return self.cfg[sec.upper()].get(item, default)
  
file_path: PaddleHub/modules/video/classification/videotag_tsn_lstm/resource/reader/reader_utils.py
label_desc: Use image node_id 3 for calling the DataReader obj's underlying member method code with example usage: obj.get_config_from_sec(sec, item, default) and returns: self, default