code: def is_online(self) -> bool:
      return (
          self.last_online
          and (time.time() - self.last_online) <= ONLINE_TIME_GAP
      )
  
file_path: labml/app/server/labml_app/db/computer.py
imports: import time
  from typing import List, Dict, Set
  from labml_db import Model, Index
label_desc: Use image node_id 2 for calling the Computer obj's underlying member method code with example usage: obj.is_online() and returns: unknown