class_docstr: All-redcue the input from the model parallel region.
class_docstr_tok: ["All-redcue","the","input","from","the","model","parallel","region","."]
code: def backward(ctx, grad_output):  # type: ignore
      return grad_output
  
imports: from typing import Any
  import torch
  from .initialize import get_model_parallel_group
  from .utils import split_tensor_along_last_dim
label_desc: Use image node_id 2 for calling the _ReduceFromModelParallelRegion obj's underlying member method code with example usage: obj.backward(ctx, grad_output) and returns: grad_output