Loss function

Triplet Loss: x i a x_i^a xia​是anchor, x i p x_i^p xip​是positive , x i n x_i^n xin​是negtive ∑ i N [ ∣ ∣ f ( x i a ) − f ( x i p ) ∣ ∣ 2 − ∣ ∣ f ( x i a ) − f ( x i n ) ∣ ∣ 2 + α ] + \sum_i^N[||f(x_i^a
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