fix

configs/pascal_voc/ssd512_voc.py

@@ -17,7 +17,7 @@ model = dict(
         type='SSDHead',
         input_size=input_size,
         in_channels=(512, 1024, 512, 256, 256, 256, 256),
-        num_classes=81,
+        num_classes=21,
         anchor_strides=(8, 16, 32, 64, 128, 256, 512),
         basesize_ratio_range=(0.1, 0.9),
         anchor_ratios=([2], [2, 3], [2, 3], [2, 3], [2, 3], [2], [2]),