fix: use alpha_t in FocalLoss as per standard formula#128
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wt7k
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Jul 7, 2025
wt7k
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- 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
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