A social RSS reader built on the AT Protocol.
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Fix division by zero in Jaccard similarity calculation
+13
-11
+13
-11
internal/cluster/jaccard.go
+13
-11
internal/cluster/jaccard.go
···
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_, err = tx.ExecContext(ctx, `
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INSERT INTO _feed_sim_staging (feed_a, feed_b, jaccard)
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-
SELECT
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s1.feed_url,
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s2.feed_url,
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SUM(EXP(-0.023 * CAST(julianday('now') - julianday(MIN(s1.added_at, s2.added_at)) AS REAL)))
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/ (f1.subscriber_count + f2.subscriber_count - CAST(COUNT(*) AS REAL))
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FROM articles.subscriptions s1
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JOIN articles.subscriptions s2 ON s1.user_did = s2.user_did AND s1.feed_url < s2.feed_url
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JOIN articles.feeds f1 ON f1.feed_url = s1.feed_url
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JOIN articles.feeds f2 ON f2.feed_url = s2.feed_url
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WHERE s1.added_at IS NOT NULL AND s2.added_at IS NOT NULL
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GROUP BY s1.feed_url, s2.feed_url
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+
SELECT feed_a, feed_b, jaccard FROM (
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+
SELECT
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s1.feed_url AS feed_a,
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+
s2.feed_url AS feed_b,
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+
SUM(EXP(-0.023 * CAST(julianday('now') - julianday(MIN(s1.added_at, s2.added_at)) AS REAL)))
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/ NULLIF(f1.subscriber_count + f2.subscriber_count - CAST(COUNT(*) AS REAL), 0) AS jaccard
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FROM articles.subscriptions s1
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JOIN articles.subscriptions s2 ON s1.user_did = s2.user_did AND s1.feed_url < s2.feed_url
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JOIN articles.feeds f1 ON f1.feed_url = s1.feed_url
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JOIN articles.feeds f2 ON f2.feed_url = s2.feed_url
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WHERE s1.added_at IS NOT NULL AND s2.added_at IS NOT NULL
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GROUP BY s1.feed_url, s2.feed_url
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) WHERE jaccard IS NOT NULL
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`)
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if err != nil {
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return err