code: def set_list_buffer(self, list_of_arrays):
      self.list_buffer = list_of_arrays
      return self.list_buffer
  
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 6 for calling the Worker obj's underlying member method code with example usage: obj.set_list_buffer(list_of_arrays) and returns: self