Comments (4)
I think there were two losses in the paper right?
The authors did use the angular loss in the next line in the code. I might be missing something though.
from mean-shifted-anomaly-detection.
I misunderstood. Actually it is the angular loss.
from mean-shifted-anomaly-detection.
Hi, I see the angular center loss is expressed as follow:
I'm confused why it is expressed as such math formual?
and i see the corresponding code is:
out_1 = model(img1)
out_2 = model(img2)
out_1 = out_1 - center
out_2 = out_2 - center
center_loss = ((out_1 ** 2).sum(dim=1).mean() + (out_2 ** 2).sum(dim=1).mean())
which seems like the traidional center loss. Could you please explain?
I also think about this, and steal can not understand. I think the right code about the angular center loss should be write like this:
def angular_loss(out_1, out_2, center):
out_1 = F.normalize(out_1, dim=-1)
out_2 = F.normalize(out_2, dim=-1)
center_loss = -((out_1 * center).sum(dim=1).mean() + (out_2 * center).sum(dim=1).mean())
return center_loss
out_1 = model(img1)
out_2 = model(img2)
center_loss = angular_loss(out_1, out_2, center)
out_1 = out_1 - center
out_2 = out_2 - center
loss = contrastive_loss(out_1, out_2) + center_loss
from mean-shifted-anomaly-detection.
Hi
Please note that optimizing the Euclidean metric when dealing with unit vectors is proportional to optimizing the angular distance multiplied by a constant factor. Therefore, this optimization process is equivalent.
Hope this clarifies your questions.
from mean-shifted-anomaly-detection.
Related Issues (14)
- Cannot reproduce results HOT 2
- Some question about the angular loss HOT 2
- Steps for inference HOT 1
- Optimizer ablation study HOT 1
- Online HOT 1
- Seek help to reproduce results. HOT 1
- model training mode
- reproducing results HOT 1
- why is model in eval mode in train HOT 4
- threshold HOT 1
- AUC ROC score seems decent even berfore learning (EPOCH 0)
- AUC ROC socre seems decent even before learning starts HOT 3
- A question about Anomaly criterion. HOT 2
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from mean-shifted-anomaly-detection.