code: def mixgather_forward_split_backward(input_, comm_spec):
      return _MixGatherForwardMixSplitBackward.apply(input_, comm_spec)
  
imports: import operator
  from enum import Enum
  from functools import reduce
  import torch
  import torch.distributed
  from torch.distributed import ReduceOp
label_desc: Use image node_id 12 for calling a global function with example usage: mixgather_forward_split_backward(input_, comm_spec) and returns: _MixGatherForwardMixSplitBackward