maybe you can not match the network structure and weight.
because the original weight model has been deleted.
you can get new weight model from http://sceneparsing.csail.mit.edu/model/pytorch/ade20k-resnet50dilated-ppm_deepsup/
but this weight can not match with the code in semantic_features .
you should update and change the code from https://github.com/CSAILVision/semantic-segmentation-pytorch/tree/master/mit_semseg
by change the code ,you can match the network structure and weight ,then you can run.