code: def replace_dict(d, u, ignored_keys=[]):
      """Replaces values in dict d with values in dict u.
  
      Args:
          d (dict): the target dict to overwrite
          u (dict): the dict containing the values to overwrite the target dict
  
      Returns:
          dict d with values overwritten by the corresponding ones in dict u.
      """
      if u is not None:
          for k, v in u.items():
              if k not in ignored_keys:
                  if v is None:
                      del_if_exists(k, d)
                      continue
                  if isinstance(v, collections.abc.Mapping):
                      d[k] = replace_dict(d.get(k, {}), v, ignored_keys)
                  else:
                      d[k] = v
      return d
  
imports: import re
  import collections.abc
  import os
  import json
  from deepspeed.runtime.constants import GRADIENT_ACCUMULATION_STEPS, TRAIN_MICRO_BATCH_SIZE_PER_GPU
  import itertools
  import copy
  from ..utils import logger
label_desc: Use image node_id 8 for calling a global function with example usage: replace_dict(d, u, ignored_keys) and returns: d