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[Fix] Fix the bug of large seg map IoU calculation #534

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[Fix] Fix the bug of large seg map IoU calculation #534

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7051be9
[fix] fix the bug of large seg map IoU calculation
May 8, 2021
7bfc804
[fix] Fix calculation error when tensor contains value larger than nu…
May 8, 2021
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[fix] Fix calculation error when tensor contains value larger than nu… 
…m_classes - 1.
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sennnnn committed May 8, 2021
commit 7bfc804cf512aced813eec9838cb8330def021a6
10 changes: 10 additions & 0 deletions mmseg/core/evaluation/metrics.py
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Original file line number Diff line number Diff line change
Expand Up @@ -70,11 +70,21 @@ def intersect_and_union(pred_label,
label = label - 1
label[label == 254] = 255

# Remove ignore_index related pixelx.
mask = (label != ignore_index)
pred_label = pred_label[mask]
label = label[mask]

intersect = pred_label[pred_label == label]

# Remove those pixels which have larger value than num_classes - 1.
# Those pixels will cause error when use `torch.bincount`, because
# `torch.bincount` can only restrict min length of count vector and
# can't restrict max length of count vector.
pred_label = pred_label[pred_label < num_classes]
label = label[label < num_classes]
intersect = intersect[intersect < num_classes]

area_intersect = torch.bincount(intersect, minlength=num_classes)
area_pred_label = torch.bincount(pred_label, minlength=num_classes)
area_label = torch.bincount(label, minlength=num_classes)
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