Focal loss for imbalanced multi class classification in Pytorch

Umair_Javaid (Umair Javaid) May 22, 2020, 3:50am 5

Can you answer this aswell?

How to get alpha values of focal loss for multiclass classification?

I am sure the gamma value of focal loss is fixed(=2) but I am confused about how to get alpha values of focal loss for multiclass classification? Is the alpha value fixed or not? I do not understand the following line: It may be set by inverse class frequency

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