docstr: Update from command line args. 
docstr_tok: ["Update","from","command","line","args","."]
code: def update_args(self, args):
      """Update from command line args."""
      for cfg in args:
          keys, v = cfg.split("=", maxsplit=1)
          keylist = keys.split(".")
  
          dic = self
          for k in keylist[:-1]:
              assert k in dir(dic), "Unknown config key: {}".format(
                  keys
              )
              dic = getattr(dic, k)
          key = keylist[-1]
  
          oldv = getattr(dic, key)
          if not isinstance(oldv, str):
              v = eval(v)
          setattr(dic, key, v)
  
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 6 for calling the AttrDict obj's underlying member method code with example usage: obj.update_args(args) without return types