code: def reset_opref(self):
      self._opref = None
  
imports: import os
  import random
  import threading
  import time
  import uuid
  import yaml
  from guild import opref
  from guild import util
  from guild import yaml_util
label_desc: Use image node_id 9 for calling the Run obj's underlying member method code with example usage: obj.reset_opref() without return types