Function distanceToScore

pkg/vector/pgvector/store.go:202–220

(distance float64, metric string)

}

func distanceToScore(distance float64, metric string) float64 {
	switch metric {
	case "cosine":
		// cosine distance in [0,2], 相似度越高距离越小
		score := 1.0 - distance
		if score < -1 {
			score = -1
		}
		if score > 1 {
			score = 1
		}
		return score
	case "l2":
		// 简单取负值, 距离越小得分越高
		return -distance
	default:
		return 1.0 - distance
	}
}