fundamentalvision/Deformable-DETR

Why is the classification cost in matcher formulated as the positive minus negative?

Godricly opened this issue · 1 comments

Godricly commented

Hi, I'm confused with this part. The computation here is different from the implementation in sigmoid_focal_loss computation. What is the purpose here to use minus sign?

Deformable-DETR/models/matcher.py

Line 81 in 11169a6

cost_class = pos_cost_class[:, tgt_ids] - neg_cost_class[:, tgt_ids]

Godricly commented

found an explaination in https://arxiv.org/pdf/2304.04742.pdf.

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