Triplet Loss

Triplet Loss

\[L = max(D_{an} - D_{ap} + m, 0)\]

Hard Example Mining

\[L = max(min(D_{an}) - max(D_{ap}) + m, 0)\]

Harder Example Mining

\[L = max((1 - \alpha)\cdot min(D_{an}) - (1 + \alpha)\cdot max(D_{ap}) + m, 0)\]