code: def _remove_callback(handle, target):
      # type: (int, Dict[int, Callable]) -> bool
      if handle in target:
          target.pop(handle, None)
          return True
      return False
  
imports: import os
  import shutil
  import sys
  import threading
  from enum import Enum
  from random import randint
  from tempfile import mkstemp
  from typing import TYPE_CHECKING, Callable, Dict, Optional, Any, Union
  import six
  from pathlib2 import Path
  from ...backend_interface.model import Model
  from ...config import running_remotely
  from ...debugging.log import get_logger
  from ...model import InputModel, OutputModel
label_desc: Use image node_id 2 for calling the WeightsFileHandler obj's underlying member method code with example usage: obj._remove_callback(handle, target) and returns: False, True