code: def update_flow(
      flow_name, add_optimizers=None, remove_optimizers=None
  ):
      """Add or remove optimizers to/from an existing flow.
  
      Args:
          flow_name (str): The name of the flow to update.
          add_optimizers (list, optional): List (str) of optimizers to add. Defaults to None.
          remove_optimizers (list, optional): List (str) of optimizers to remove. Defaults to None.
      """
      flow = get_flow(flow_name)
      if add_optimizers is not None:
          for opt in add_optimizers:
              flow._add_optimizer(opt)
  
      if remove_optimizers is not None:
          for opt in remove_optimizers:
              flow._remove_optimizer(opt)
  
file_path: hls4ml/hls4ml/model/flow/flow.py
label_desc: Use image node_id 3 for calling a global function with example usage: update_flow(flow_name, add_optimizers, remove_optimizers) without return types