code: def __init__(self):
      self.send = cp.ones((4,), dtype=cp.float32)
      self.recv = cp.zeros((4,), dtype=cp.float32)
  
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 1 to create a new Worker object  with example: obj = Worker()