selene-db-graph 1.3.0

In-memory property-graph storage core (ArcSwap + imbl CoW, label/typed indexes, write funnel) for selene-db.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175

use super::*;

#[test]
fn hnsw_vector_index_tracks_membership_and_metric() {
    let shared = SharedGraph::new(GraphId::new(8105));
    let label = db_string("vector.index.hnsw");
    let property = db_string("embedding");
    {
        let mut txn = shared.begin_write();
        let mut mutator = txn.mutator();
        mutator
            .create_node(
                LabelSet::single(label.clone()),
                props([(property.clone(), vector(&[1.0, 0.0]))]),
            )
            .unwrap();
        mutator
            .create_node(
                LabelSet::single(label.clone()),
                props([(property.clone(), vector(&[2.0, 0.0]))]),
            )
            .unwrap();
        txn.commit().unwrap();
    }

    shared
        .create_vector_index(
            label.clone(),
            property.clone(),
            VectorIndexKind::HnswSquaredEuclidean,
            2,
        )
        .unwrap();

    let index = shared.read().vector_index_for(&label, &property).unwrap();
    assert!(index.is_hnsw());
    assert_eq!(index.hnsw_metric(), Some(VectorMetric::SquaredEuclidean));
    assert_eq!(index.rows().iter().collect::<Vec<_>>(), vec![0, 1]);
}

#[test]
fn ivf_vector_index_tracks_membership_and_metric() {
    let shared = SharedGraph::new(GraphId::new(8110));
    let label = db_string("vector.index.ivf");
    let property = db_string("embedding");
    {
        let mut txn = shared.begin_write();
        let mut mutator = txn.mutator();
        mutator
            .create_node(
                LabelSet::single(label.clone()),
                props([(property.clone(), vector(&[1.0, 0.0]))]),
            )
            .unwrap();
        mutator
            .create_node(
                LabelSet::single(label.clone()),
                props([(property.clone(), vector(&[2.0, 0.0]))]),
            )
            .unwrap();
        txn.commit().unwrap();
    }

    shared
        .create_vector_index(
            label.clone(),
            property.clone(),
            VectorIndexKind::IvfSquaredEuclidean,
            2,
        )
        .unwrap();

    let index = shared.read().vector_index_for(&label, &property).unwrap();
    assert!(index.is_ivf());
    assert_eq!(index.ann_metric(), Some(VectorMetric::SquaredEuclidean));
    assert_eq!(index.rows().iter().collect::<Vec<_>>(), vec![0, 1]);
    let usage = index.memory_usage();
    assert_eq!(usage.ivf_entries, 2);
    assert_eq!(usage.ivf_live_entries, 2);
    assert_eq!(usage.ivf_assigned_entries, 2);
    assert_eq!(usage.ivf_pending_retrain_entries, 0);
    assert!(usage.ivf_non_empty_list_count > 0);
    assert!(usage.ivf_max_list_len > 0);
    assert_eq!(
        usage.ivf_average_list_len_basis_points,
        usage.ivf_assigned_entries * 10_000 / usage.ivf_list_count
    );
    assert!(usage.ivf_centroids > 0);
}

#[test]
fn hnsw_vector_index_stores_explicit_construction_config() {
    let shared = SharedGraph::new(GraphId::new(8108));
    let label = db_string("vector.index.hnsw.config");
    let property = db_string("embedding");
    let config = HnswIndexConfig::new(24, 128);
    {
        let mut txn = shared.begin_write();
        let mut mutator = txn.mutator();
        mutator
            .create_node(
                LabelSet::single(label.clone()),
                props([(property.clone(), vector(&[1.0, 0.0]))]),
            )
            .unwrap();
        mutator
            .create_node(
                LabelSet::single(label.clone()),
                props([(property.clone(), vector(&[0.0, 1.0]))]),
            )
            .unwrap();
        txn.commit().unwrap();
    }

    shared
        .create_vector_index_named_with_config(
            label.clone(),
            property.clone(),
            VectorIndexKind::HnswCosine,
            2,
            None,
            Some(config),
        )
        .unwrap();

    let index = shared.read().vector_index_for(&label, &property).unwrap();
    assert_eq!(index.hnsw_config(), Some(config));
    assert_eq!(index.hnsw_metric(), Some(VectorMetric::Cosine));
    assert_eq!(index.rows().iter().collect::<Vec<_>>(), vec![0, 1]);
}

#[test]
fn hnsw_config_is_rejected_for_flat_or_invalid_hnsw_shapes() {
    let shared = SharedGraph::new(GraphId::new(8109));
    let label = db_string("vector.index.hnsw.config.reject");
    let property = db_string("embedding");

    let flat_err = shared
        .create_vector_index_named_with_config(
            label.clone(),
            property.clone(),
            VectorIndexKind::Flat,
            2,
            None,
            Some(HnswIndexConfig::new(24, 128)),
        )
        .unwrap_err();
    assert!(matches!(
        flat_err,
        GraphError::VectorIndexInvalidHnswConfig {
            max_neighbors: 24,
            ef_construction: 128,
            reason: "only HNSW vector indexes accept HNSW config",
        }
    ));

    let invalid_err = shared
        .create_vector_index_named_with_config(
            label,
            property,
            VectorIndexKind::HnswSquaredEuclidean,
            2,
            None,
            Some(HnswIndexConfig::new(24, 8)),
        )
        .unwrap_err();
    assert!(matches!(
        invalid_err,
        GraphError::VectorIndexInvalidHnswConfig {
            max_neighbors: 24,
            ef_construction: 8,
            reason: "ef_construction must be at least max_neighbors",
        }
    ));
}