after some checking, the weighing terms (1-p)^gamma and p^gamma are back propagated as well. you can refer to:
https://github.com/zimenglan-sysu-512/paper-note/blob/master/focal_loss.pdf
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after some checking, the weighing terms (1-p)^gamma and p^gamma are back propagated as well. you can refer to:
https://github.com/zimenglan-sysu-512/paper-note/blob/master/focal_loss.pdf