fix: deterministic search ranking ties by recency - #6626
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chakshu-dhannawat wants to merge 1 commit into
Open
fix: deterministic search ranking ties by recency#6626chakshu-dhannawat wants to merge 1 commit into
chakshu-dhannawat wants to merge 1 commit into
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Make `score_and_rank` / `scoreAndRank` break equal combined scores by: 1. newer `updated_at` 2. newer `created_at` 3. stable memory ID asc Missing or malformed timestamps are treated as older than valid ones. Implemented in both Python and TypeScript OSS with parity tests. Closes mem0ai#5205
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Linked Issue
Closes #5205
Description
Adds stable tie-breaking to
score_and_rank(Python) andscoreAndRank(TypeScript) so memories with the same hybrid score are ordered deterministically. The tie-break order is:updated_atcreated_atMissing or malformed timestamps are treated as older than valid ones. This removes backend-order randomness without changing the relevance scoring or adding a general recency boost.
Type of Change
Breaking Changes
N/A
Test Coverage
tests/utils/test_scoring.pyand TypeScript tests inmem0-ts/src/oss/tests/scoring.test.tscovering equal-score ties, missing/malformed timestamps, and ID stability.MEM0_TELEMETRY=False hatch run pytest tests/utils/test_scoring.py(26 passed) andpnpm run test -- scoring.test(8 passed).hatch run ruff checkandpnpm run buildsuccessfully.Checklist