why use "val = val.permute(4, 0, 1, 2, 3)" when export scn to onnx in centerpoint net

[pangweisong]

hello, i wanna know why use val = val.permute(4, 0, 1, 2, 3) when export scn to onnx in centerpoint, all pth files are generated in sp2.X thank you!