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What is the class id for background class?
See original GitHub issueI have a quick question: is the background class id 0 or 91? (DETR used 91 COCO categories to train)
It seems the targets object returned by dataloader uses 1-91 for all the object categories, but the loss_labels function used 91 instead of 0 for background. I am not sure if I missed something.
Thanks.
Issue Analytics
- State:
- Created 3 years ago
- Comments:7 (2 by maintainers)
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@raviv DETR uses the last value for the class. So if you have 10 classes, you should set
num_classesto 10 and class index 10 will be the background,EDIT: corrected the value for
num_classes, the no-object class is added in the model definition@fmassa same question as @zhishao . For an image without an object(negative example), how do we label it in COCO format? Do we label the annotations bbox as all zeros? Or we do not even label it, since there’s an extra class built in to handle no-object? Thanks!