code: def get_buffer(self):
      return self.buffer0, self.buffer1
  
imports: import cupy
  import logging
  import ray
  import ray.util.collective
  from ray.util.collective.types import Backend, ReduceOp
  from ray.util.collective.collective_group.nccl_util import get_num_gpus
  import torch
label_desc: Use image node_id 7 for calling the MultiGPUWorker obj's underlying member method code with example usage: obj.get_buffer() and returns: self,  self