code: def __setattr__(self, name, value):
      if self._freezed and name not in self.__dict__:
          raise AttributeError(
              "Config was freezed! Unknown config: {}".format(name)
          )
      super().__setattr__(name, value)
  
file_path: tensorpack/examples/FasterRCNN/config.py
imports: import numpy
  import os
  import pprint
  import six
  from tensorpack.utils import logger
  from tensorpack.utils.gpu import get_num_gpu
label_desc: Use image node_id 2 for calling the AttrDict obj's underlying member method code with example usage: obj.__setattr__(name, value) without return types