code: def symbolic(graph, input_):
      return _mix_gather(input_)
  
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 1 for calling the _MixGatherForwardMixSplitBackward obj's underlying member method code with example usage: obj.symbolic(graph, input_) and returns: _mix_gather