code: def result(self):
      ret = self._graph.result()
      self._graph.release_op()
      del self._graph
      return ret
  
imports: import re
  from typing import Dict, Any, Union, Tuple, List
  from concurrent.futures import ThreadPoolExecutor
  from towhee.tools import visualizers
  from towhee.utils.log import engine_log
  from .operator_manager import OperatorPool
  from .data_queue import DataQueue
  from .dag_repr import DAGRepr
  from .nodes import create_node, NodeStatus
  from .node_repr import NodeRepr
  from .time_profiler import TimeProfiler, Event
label_desc: Use image node_id 2 for calling the _GraphResult obj's underlying member method code with example usage: obj.result() and returns: ret