docstr: Generate an NCCL unique ID for initializing communicators.
  
  The method will also create a KV store using Ray named actor and store
  the NCCLUniqueID in the store. The store needs to be garbage collected
  when destroying the collective group.
  
  Args:
      key: the key of the .
  
  Returns:
      NCCLUniqueID (str): NCCL unique ID.
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code: def _generate_nccl_uid(self, key):
      """Generate an NCCL unique ID for initializing communicators.
  
      The method will also create a KV store using Ray named actor and store
      the NCCLUniqueID in the store. The store needs to be garbage collected
      when destroying the collective group.
  
      Args:
          key: the key of the .
  
      Returns:
          NCCLUniqueID (str): NCCL unique ID.
      """
      group_uid = nccl_util.get_nccl_unique_id()
      store_name = get_store_name(key)
      # Avoid a potential circular dependency in ray/actor.py
      from ray.util.collective.util import NCCLUniqueIDStore
  
      store = NCCLUniqueIDStore.options(
          name=store_name, lifetime="detached"
      ).remote(store_name)
      ray.get([store.set_id.remote(group_uid)])
      return group_uid
  
imports: import logging
  import datetime
  import time
  import ray
  import cupy
  from ray.util.collective.const import ENV
  from ray.util.collective.collective_group import nccl_util
  from ray.util.collective.collective_group.base_collective_group import BaseGroup
  from ray.util.collective.const import get_store_name
  from ray.util.collective.types import AllReduceOptions, BarrierOptions, Backend, ReduceOptions, BroadcastOptions, AllGatherOptions, ReduceScatterOptions, SendOptions, RecvOptions
  from ray.util.collective.collective_group.cuda_stream import get_stream_pool
label_desc: Use image node_id 17 for calling the NCCLGroup obj's underlying member method code with example usage: obj._generate_nccl_uid(key) and returns: group_uid