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Fix embedding calculation for sqlite #261

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merged 2 commits into from
Nov 13, 2024
Merged

Fix embedding calculation for sqlite #261

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dbdecf8
Fix embedding calculation for sqlite
ferric-sol Nov 11, 2024
c226308
Resolve merge conflict
ferric-sol Nov 11, 2024
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45 changes: 34 additions & 11 deletions packages/adapter-sqlite/src/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -337,28 +337,51 @@ export class SqliteDatabaseAdapter extends DatabaseAdapter {
query_field_sub_name: string;
query_match_count: number;
}): Promise<{ embedding: number[]; levenshtein_score: number }[]> {
// First get content text and calculate Levenshtein distance
const sql = `
WITH content_text AS (
SELECT
embedding,
json_extract(
json(content),
'$.' || ? || '.' || ?
) as content_text
FROM memories
WHERE type = ?
AND json_extract(
json(content),
'$.' || ? || '.' || ?
) IS NOT NULL
)
SELECT
embedding,
0 as levenshtein_score -- Using 0 as placeholder score
FROM memories
WHERE type = ?
AND json_extract(content, '$.' || ? || '.' || ?) IS NOT NULL
length(?) + length(content_text) - (
length(?) + length(content_text) - (
length(replace(lower(?), lower(content_text), '')) +
length(replace(lower(content_text), lower(?), ''))
) / 2
) as levenshtein_score
FROM content_text
ORDER BY levenshtein_score ASC
LIMIT ?
`;

const params = [
const rows = this.db.prepare(sql).all(
opts.query_field_name,
opts.query_field_sub_name,
opts.query_table_name,
opts.query_field_name,
opts.query_field_sub_name,
opts.query_input,
opts.query_input,
opts.query_input,
opts.query_input,
opts.query_match_count
];

const rows = this.db.prepare(sql).all(...params);
) as { embedding: Buffer; levenshtein_score: number }[];

return rows.map((row) => ({
embedding: row.embedding,
levenshtein_score: 0
return rows.map(row => ({
embedding: Array.from(new Float32Array(row.embedding as Buffer)),
levenshtein_score: row.levenshtein_score
}));
}

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