fix: use alpha_t in FocalLoss as per standard formula #128

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wt7k wants to merge 1 commit into dsgiitr:master from wt7k:fix/focal-loss-alpha-t

wt7k commented Jul 7, 2025

之前 FocalLoss 中计算的 alpha_t 未被使用，导致权重没加上
修改后 loss 计算遵循论文公式：loss = - alpha_t * (1 - pt)^gamma * log(pt)
保留原先 pt 的计算方式，符合概率定义


          fix: use alpha_t in FocalLoss as per standard formula

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