code: def compute(self):
      collective.allreduce(self.send, "default")
      return self.send
  
file_path: ray/python/ray/util/collective/examples/nccl_allreduce_example.py
imports: import ray
  import cupy
  import ray.util.collective
label_desc: Use image node_id 3 for calling the Worker obj's underlying member method code with example usage: obj.compute() and returns: self