learning rate四种改变方式

Fixed

learning rate固定不变

base_lr = 0.01 lr_policy = "fixed"

Step

learning rate在每迭代stepsize次后减少gamma倍。lr=lr×gamma

base_lr = 0.01 lr_policy = "step" gamma = 0.1 stepsize= 10000

Polynomial

learning rate呈多项式曲线下降。LR(t)=base_lr×(tT)power

base_lr = 0.01 lr_policy = "poly" power = 0.5

Inv

learning rate随迭代次数增加而下降。LR(t)=base_lr×(1+gamma×iter)power

base_lr = 0.01 lr_policy = "Inv" gamma = 0.0001 power = 0.75

总结

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