code: def init_tensors(self):
      self.buffer = cp.ones((10,), dtype=cp.float32)
      self.list_buffer = [
          cp.ones((10,), dtype=cp.float32) for _ in range(2)
      ]
      cp.cuda.Stream.null.synchronize()
      return True
  
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 2 for calling the Worker obj's underlying member method code with example usage: obj.init_tensors() and returns: True