class_docstr: sys conf
class_docstr_tok: ["sys","conf"]
code: def device_id(self):
      return self._device_id
  
file_path: towhee/towhee/runtime/runtime_conf.py
imports: import contextvars
  import contextlib
  import functools
label_desc: Use image node_id 2 for calling the SysConf obj's underlying member method code with example usage: obj.device_id() and returns: self