code: def get_flow(name):
      if name in flow_map:
          return flow_map[name]
      else:
          raise Exception(f"Unknown flow: {name}")
  
file_path: hls4ml/hls4ml/model/flow/flow.py
label_desc: Use image node_id 4 for calling a global function with example usage: get_flow(name) and returns: flow_map