code: def serialize_scatter(identifier):
      if identifier in OP_DICT:
          return identifier
      elif hasattr(identifier, "__name__"):
          for k, v in OP_DICT.items():
              if v.__name__ == identifier.__name__:
                  return k
          return None
  
file_path: spektral/spektral/layers/ops/scatter.py
imports: import tensorflow
label_desc: Use image node_id 8 for calling a global function with example usage: serialize_scatter(identifier) and returns: identifier, None, k