code: def merge_dicts(src: Dict, to_update: Dict) -> Dict:
      """Recursively merges dictionaries.
  
      Args:
          src (dict): source dictionary of parameters
          to_update (dict): dictionary of parameters to merge into src
      """
      for key, value in to_update.items():
          _merge_item(src, key, value)
      return src
  
file_path: dvc/dvc/utils/collections.py
imports: from collections.abc import Mapping
  from typing import Dict, Iterable, List, Union, no_type_check
label_desc: Use image node_id 5 for calling a global function with example usage: merge_dicts(src, to_update) and returns: src