code: def _get_expert_data_parallel_group(group_name):
      """Get the expert data parallel group the caller rank belongs to."""
      assert (
          group_name in _EXPERT_DATA_PARALLEL_GROUP
      ), "expert data parallel group is not initialized"
      return _EXPERT_DATA_PARALLEL_GROUP[group_name]
  
imports: from deepspeed import comm
  from deepspeed.utils import log_dist
  from deepspeed.utils.exceptions import DeprecatedException
label_desc: Use image node_id 12 for calling a global function with example usage: _get_expert_data_parallel_group(group_name) and returns: _EXPERT_DATA_PARALLEL_GROUP