Dataset PASCAL VOC 2012 Visit this, download SBD and PASCAL VOC 2012 Extract them, you will get benchmark_RELEASE and VOCdevkit folders. Add file seg11valid.txt (download) into VOCdevkit/VOC2012/ImageSets/Segmentation Put the benchmark_RELEASE and VOCdevkit folders in a folder called VOC Set the path (root) of VOC folder in the last step in voc.py Cityscapes Download leftImg8bit_trainvaltest, gtFine_trainvaltest, leftImg8bit_trainextra, and gtCoarse from the cityscapes website Extract and put them in a folder called cityscapes Set the path (root) of cityscapes folder in the last step in cityscapes.py