Sensitivity

검색된 정보 중에서 관련 있는 정보가 얼마나 잘 검색되었는지

Sensitivity = P(Predict=1|Actual=1)

\frac{TP}{TP +FN}

Sensitivity are in a Trade-off relationship, so we use the

F1-score. We use it to find a suitable point where both are high.