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fix fcos gt_areas calculation #5816

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Merged
merged 3 commits into from
Apr 19, 2022
Merged

fix fcos gt_areas calculation #5816

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136eed3
fix fcos gtarea calculation
simonJJJ Apr 14, 2022
b136964
Merge branch 'main' into fix_fcos_gtarea_calc
simonJJJ Apr 17, 2022
3a7a091
Merge branch 'main' into fix_fcos_gtarea_calc
datumbox Apr 19, 2022
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2 changes: 1 addition & 1 deletion torchvision/models/detection/fcos.py
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Original file line number Diff line number Diff line change
Expand Up @@ -471,7 +471,7 @@ def compute_loss(
pairwise_match &= (pairwise_dist > lower_bound[:, None]) & (pairwise_dist < upper_bound[:, None])

# match the GT box with minimum area, if there are multiple GT matches
gt_areas = (gt_boxes[:, 1] - gt_boxes[:, 0]) * (gt_boxes[:, 3] - gt_boxes[:, 1]) # N
gt_areas = (gt_boxes[:, 2] - gt_boxes[:, 0]) * (gt_boxes[:, 3] - gt_boxes[:, 1]) # N
pairwise_match = pairwise_match.to(torch.float32) * (1e8 - gt_areas[None, :])
min_values, matched_idx = pairwise_match.max(dim=1) # R, per-anchor match
matched_idx[min_values < 1e-5] = -1 # unmatched anchors are assigned -1
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