code: def _callback(name, op, *rest_args):
      if op.callbacks:
          cb = getattr(op.callbacks, name, None)
          if cb:
              cb(op, *rest_args)
  
imports: import logging
  import os
  import subprocess
  import time
  from guild import config
  from guild import exit_code
  from guild import log
  from guild import op_dep
  from guild import op_util
  from guild import run
  from guild import util
label_desc: Use image node_id 1 for calling a global function with example usage: _callback(name, op) without return types