code: def do_broadcast(self, group_name="default", src_rank=0):
      col.broadcast(self.buffer, src_rank, group_name)
      return self.buffer
  
imports: import numpy
  import logging
  import ray
  import ray.util.collective
  from ray.util.collective.types import Backend, ReduceOp
  import torch
label_desc: Use image node_id 9 for calling the Worker obj's underlying member method code with example usage: obj.do_broadcast(group_name, src_rank) and returns: self