code: def add_dict_values(
      dict_a: dict, dict_b: dict, inplace=False
  ) -> dict:
      """Add two dictionaries, summing the values of elements with the same key.
  
      This function iterates over the keys of dict_b and adds their corresponding
      values to the elements in dict_a. If dict_b has a (key, value) pair that
      does not belong to dict_a, this pair is added to the latter dictionary.
  
      Parameters
      ----------
      dict_a
          dictionary to update.
      dict_b
          dictionary whose values will be added to `dict_a`.
      inplace
          If `True`, the addition is performed in-place and results are stored in `dict_a`.
          If `False`, `dict_a` is not changed and the results are returned in a new dictionary.
  
      Returns
      -------
      A dictionary containing the result of the operation. Either a pointer to
      `dict_a` or a new dictionary depending on parameter `inplace`.
  
      """
      if inplace:
          result = dict_a
      else:
          result = copy.deepcopy(dict_a)
  
      for k, v in dict_b.items():
          try:
              result[k] += v
          except KeyError:
              result[k] = v
      return result
  
imports: from __future__ import annotations
  import collections
  import copy
  import dataclasses
  import functools
  import math
  import sys
  import typing
  from river.base.typing import FeatureName
  from river.stats import Cov, Var
label_desc: Use image node_id 3 for calling a global function with example usage: add_dict_values(dict_a, dict_b, inplace) and returns: result