关于onnx文件output

[qq577288254]

那640*640的图片80类来说，我们的是
output
name: output
tensor: float32[1,255,20,20]
691
name: 691
tensor: float32[1,255,40,40]
690
name: 690
tensor: float32[1,255,80,80]

官网的是

output
name: output
tensor: float32[1,25200,85]
350
name: 350
tensor: float32[1,3,80,80,85]
416
name: 416
tensor: float32[1,3,40,40,85]
482
name: 482
tensor: float32[1,3,20,20,85]

官网的['output']是由我们['output', '691', '690']组合而成，请问我们该如何reshape+concat才能变成一样格式onnx？