Function train_then_encode_roundtrip

nodedb-vector/src/rerank/codecs/pq.rs:249–259

()

    #[test]
    fn train_then_encode_roundtrip() {
        let codec = trained();
        let v = det_vec(0, DIM);
        let enc = codec.encode(&v).expect("encode");
        let prep = codec.prepare_query(&v).expect("prepare_query");
        let dist = codec.distance_prepared(&prep, &enc).expect("distance");
        assert!(dist.is_finite(), "distance must be finite, got {dist}");
        assert!(dist >= 0.0, "distance must be non-negative, got {dist}");
        // Self-distance should be small for ADC on identical vector.
        assert!(dist < 1.0, "self-distance too large: {dist}");
    }

    #[test]
    fn encode_before_train_returns_not_trained() {