metric deep learning loss
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1. softmax loss
Forward:
Backward:
交叉熵softmax注意事项:
1. 在用softmaxloss训练模型时,如果学习率太大,可能会导致loss=NAN。考虑上面第(2)式子,如果j=k时,
2. 考虑数值计算稳定性情况下的Softmax损失函数
因为指数计算和指数求和的结果可能非常大,会出现overflow,超出浮点数的范围。
2. Center loss
Foward:
Backward:
在线更新
3.Triplet Loss
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