how can you know a anchor/sample is negative or positive?

[chenslcool]

I your paper 4.4, you propose three method dealing with "Hard Negative Samples". however, ther's no gt box label in ssod, how can you determine a sample is negative or not?

[ZRandomize]

Please kindly check the footprint:

Since the “unlabeled images” under the COCO-Standard setting actually come with annotations, we can perform label assignments on images using these annotations. The difference between our division (k = 1) and the assigned foreground is defined as hard negatives

[chenslcool]

I got you. Thanks.