A small knowledge-graph layer that does two distinct jobs:
1. SYNONYM_GROUPS broaden retrieval. A query mentioning "Athlon"
now also matches AMD-titled docs because Athlon IS an AMD product.
Groups currently cover AMD-family, Intel-family, HTTP family,
FTP, Mac, Windows, Linux. Easy to extend.
2. RIVALRIES narrow retrieval. The pair (AMD-group, Intel-group)
means: if the query mentions one side and not the other, drop
docs whose titles contain the OTHER side's tokens. So a "fastest
AMD CPU" question never gets Pentium_4 in the context — even if
FTS5 BM25 ranks it high — because Pentium is in the Intel group
and Intel isn't in the query.
COMPARE_WORDS ("vs", "versus", "compare", "between", ...) suppress
the exclusion. "compare AMD vs Intel" keeps both sides. "what is
the fastest AMD CPU?" does not.
Demos against the 128k Wikipedia 2003-05-16 cur shards:
Q "fastest AMD CPU" → 8 sources, all AMD/CPU titled, NO Intel
Answer: "Athlon XP 3200+" (real AMD chip,
grounded in the AMD article)
Q "compare AMD vs Intel"
→ 8 sources, mix of Intel_8028x, Intel_8048x,
AMD_Duron — both sides preserved
Q "Athlon processor" → AMD, AMD_Duron, AMD_5x86, Athlon all
surfaced via synonym expansion
Phase 1 implementation hand-curates the groups; Phase 2 idea is to
derive them from Wikipedia's link/category graph (dense bidirectional
clusters → synonym groups; same-category-without-cross-links →
rivalry candidates).
66 tests passing.
russell@unturf.com
c6182ae54e