Train model problem

[Cun-bao]

I train the DDRNet_23_silm and use the pretrained model but I get a wrong result, the mIoU only 58%, too low than your result in paper.I also find the loss decline is slow, the best loss is 0.9.
I use a single GPU, lr:3e-3, epochs:500, optim:SGD, loss:ohemceloss