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I think there is error in focal loss #2

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suminlee94 opened this issue Sep 13, 2021 · 0 comments
Open

I think there is error in focal loss #2

suminlee94 opened this issue Sep 13, 2021 · 0 comments

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@suminlee94
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 logpt = - F.binary_cross_entropy_with_logits(input, target, pos_weight=weight, reduction=self.reduction)
pt = torch.exp(logpt)

 # compute the loss
focal_loss = -( (1-pt)**self.gamma ) * logpt

'logpt' is actually -log(p_t).
so....pt is not same as log(sigmoid(input)).
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