code: def _register_cloudpickle_reducer(self, cls, reducer):
      pickle.CloudPickler.dispatch[cls] = reducer
  
file_path: ray/python/ray/util/serialization.py
imports: import ray
  import ray.cloudpickle
  from ray.util.annotations import DeveloperAPI, PublicAPI
label_desc: Use image node_id 1 for calling the StandaloneSerializationContext obj's underlying member method code with example usage: obj._register_cloudpickle_reducer(cls, reducer) without return types