code: def reduce_grad(input_, comm_spec):
      return _ReduceGrad.apply(input_, comm_spec)
  
imports: from enum import Enum
  from typing import Dict
  import torch
  import torch.distributed
  from torch.distributed import ReduceOp
label_desc: Use image node_id 5 for calling a global function with example usage: reduce_grad(input_, comm_spec) and returns: _ReduceGrad