Add classes to Cityscapes (#739)

torchvision/datasets/cityscapes.py

 import json
 import os
+from collections import namedtuple
 
 import torch.utils.data as data
 from PIL import Image
@@ -48,6 +49,48 @@ class Cityscapes(data.Dataset):
             img, smnt = dataset[0]
     """
 
+    # Based on https://github.com/mcordts/cityscapesScripts
+    CityscapesClass = namedtuple('CityscapesClass', ['name', 'id', 'train_id', 'category', 'category_id',
+                                                     'has_instances', 'ignore_in_eval', 'color'])
+
+    classes = [
+        CityscapesClass('unlabeled', 0, 255, 'void', 0, False, True, (0, 0, 0)),
+        CityscapesClass('ego vehicle', 1, 255, 'void', 0, False, True, (0, 0, 0)),
+        CityscapesClass('rectification border', 2, 255, 'void', 0, False, True, (0, 0, 0)),
+        CityscapesClass('out of roi', 3, 255, 'void', 0, False, True, (0, 0, 0)),
+        CityscapesClass('static', 4, 255, 'void', 0, False, True, (0, 0, 0)),
+        CityscapesClass('dynamic', 5, 255, 'void', 0, False, True, (111, 74, 0)),
+        CityscapesClass('ground', 6, 255, 'void', 0, False, True, (81, 0, 81)),
+        CityscapesClass('road', 7, 0, 'flat', 1, False, False, (128, 64, 128)),
+        CityscapesClass('sidewalk', 8, 1, 'flat', 1, False, False, (244, 35, 232)),
+        CityscapesClass('parking', 9, 255, 'flat', 1, False, True, (250, 170, 160)),
+        CityscapesClass('rail track', 10, 255, 'flat', 1, False, True, (230, 150, 140)),
+        CityscapesClass('building', 11, 2, 'construction', 2, False, False, (70, 70, 70)),
+        CityscapesClass('wall', 12, 3, 'construction', 2, False, False, (102, 102, 156)),
+        CityscapesClass('fence', 13, 4, 'construction', 2, False, False, (190, 153, 153)),
+        CityscapesClass('guard rail', 14, 255, 'construction', 2, False, True, (180, 165, 180)),
+        CityscapesClass('bridge', 15, 255, 'construction', 2, False, True, (150, 100, 100)),
+        CityscapesClass('tunnel', 16, 255, 'construction', 2, False, True, (150, 120, 90)),
+        CityscapesClass('pole', 17, 5, 'object', 3, False, False, (153, 153, 153)),
+        CityscapesClass('polegroup', 18, 255, 'object', 3, False, True, (153, 153, 153)),
+        CityscapesClass('traffic light', 19, 6, 'object', 3, False, False, (250, 170, 30)),
+        CityscapesClass('traffic sign', 20, 7, 'object', 3, False, False, (220, 220, 0)),
+        CityscapesClass('vegetation', 21, 8, 'nature', 4, False, False, (107, 142, 35)),
+        CityscapesClass('terrain', 22, 9, 'nature', 4, False, False, (152, 251, 152)),
+        CityscapesClass('sky', 23, 10, 'sky', 5, False, False, (70, 130, 180)),
+        CityscapesClass('person', 24, 11, 'human', 6, True, False, (220, 20, 60)),
+        CityscapesClass('rider', 25, 12, 'human', 6, True, False, (255, 0, 0)),
+        CityscapesClass('car', 26, 13, 'vehicle', 7, True, False, (0, 0, 142)),
+        CityscapesClass('truck', 27, 14, 'vehicle', 7, True, False, (0, 0, 70)),
+        CityscapesClass('bus', 28, 15, 'vehicle', 7, True, False, (0, 60, 100)),
+        CityscapesClass('caravan', 29, 255, 'vehicle', 7, True, True, (0, 0, 90)),
+        CityscapesClass('trailer', 30, 255, 'vehicle', 7, True, True, (0, 0, 110)),
+        CityscapesClass('train', 31, 16, 'vehicle', 7, True, False, (0, 80, 100)),
+        CityscapesClass('motorcycle', 32, 17, 'vehicle', 7, True, False, (0, 0, 230)),
+        CityscapesClass('bicycle', 33, 18, 'vehicle', 7, True, False, (119, 11, 32)),
+        CityscapesClass('license plate', -1, -1, 'vehicle', 7, False, True, (0, 0, 142)),
+    ]
+
     def __init__(self, root, split='train', mode='fine', target_type='instance',
                  transform=None, target_transform=None):
         self.root = os.path.expanduser(root)