WFGY/ProblemMap/GlobalFixMap/Language/hybrid_ranking_multilingual.md

Hybrid Ranking in Multilingual Corpora · Global Fix Map

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Stabilize hybrid retrieval across languages and scripts. Lock bm25 to dense weights, keep analyzers and tokenizers aligned, and verify with ΔS, λ, and coverage targets.

---

Open these first

• Visual map and recovery → rag-architecture-and-recovery.md
• End to end retrieval knobs → retrieval-playbook.md
• Traceability schema → retrieval-traceability.md
• Contract the payload → data-contracts.md
• Tokenizer variance → tokenizer_mismatch.md
• Mixed scripts → script_mixing.md
• Locale normalization → locale_drift.md
• Romanization rules → romanization_transliteration.md
• Proper nouns and aliases → proper_noun_aliases.md
• Language detection → query_language_detection.md
• Analyzer routing → query_routing_and_analyzers.md

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Core acceptance targets

• ΔS(question, retrieved) ≤ 0.45 on three paraphrases and two seeds
• Coverage of target section ≥ 0.70
• λ convergent when switching between native script and romanized forms
• Rank@k is stable across analyzer choices for the same corpus and query set
• Reranker never flips a correct snippet out of top-k after hybrid fusion

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What usually breaks

Symptom	Likely cause	Open this
High recall but unstable rank across runs	hybrid weight drift or nondeterministic tie handling	retrieval-playbook.md
Good dense hits, poor lexical for CJK	analyzer mismatch or missing bigram field	script_mixing.md
Romanized queries fail while native works	alias view absent in fusion	romanization_transliteration.md
JSON mode breaks after reranking	tokenizer profile differs between stages	tokenizer_mismatch.md
Brand equals common word in second language	alias collision and unscoped synonyms	proper_noun_aliases.md

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Stable hybrid recipes

Use these as starting points then tune by ΔS and coverage. Always log weights and determinize tie rules.

A) Latin heavy corpora

• Analyzer: locale aware Latin
• Start weights: bm25 0.4, dense 0.6
• Reranker: on for top 100 → 20
• Tie rule: lexical score as primary tie breaker

B) CJK corpora

• Analyzer: CJK bigram or language specific
• Start weights: bm25 0.55, dense 0.45
• Reranker: on, but keep citations from native script fields
• Add alias views: romaji or pinyin for entities only

C) Semitic RTL corpora

• Analyzer: RTL with width and digit normalization
• Start weights: bm25 0.5, dense 0.5
• Reranker: on, strict JSON schema in later steps

D) Cyrillic and Greek

• Analyzer: script aware with accent controls
• Start weights: bm25 0.45, dense 0.55
• Reranker: on, cross check aliases if brands exist

E) Code mixed user queries

• Dual route: native analyzer plus romanized alias probe
• Start weights: bm25 0.5, dense 0.5
• Determinize the fusion and log both analyzer paths

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Deterministic fusion checklist

1. Fix seeds for dense stage and for reranker.
2. Bucketize scores before fusion to avoid floating noise.
3. Set a stable tie breaker: lexical score, then doc id.
4. Cap max per-section to avoid one section flooding top-k.
5. Fuse fields with the same analyzer class only.
6. Keep the fusion function constant across languages inside the same pipeline.

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Copy snippets

A. Fusion function sketch

def fuse(bm25, dense, w_lex=0.5, w_vec=0.5):
    # bm25 and dense are lists of (doc_id, score)
    import math
    L = {d: s for d, s in bm25}
    V = {d: s for d, s in dense}
    docs = set(L) | set(V)
    out = []
    for d in docs:
        l = L.get(d, 0.0)
        v = V.get(d, 0.0)
        # bucketize to stabilize small drifts
        lb = round(l, 3)
        vb = round(v, 3)
        score = w_lex * lb + w_vec * vb
        out.append((d, score, lb, vb))
    # stable sort: score desc, then lexical bucket, then doc id
    out.sort(key=lambda x: (-x[1], -x[2], x[0]))
    return out

B. Rerank gate

def rerank_gate(items, target_k=20):
    # never drop below k if citations exist and ΔS is already ≤ 0.45
    keep = []
    for d, score, lb, vb, meta in items:
        if meta.get("has_citation") and meta.get("delta_s", 1.0) <= 0.45:
            meta["protected"]=True
        keep.append((d, score, meta))
    return keep[:target_k]

C. Trace fields to log

{
  "fusion": {"w_bm25": 0.55, "w_dense": 0.45, "tie": "lex,doc_id"},
  "analyzer_id": "store:cjk",
  "tokenizer_profile": "retriever:cjk",
  "alias_views": ["name_romaji","name_pinyin"],
  "ΔS": 0.41,
  "λ_state": "<>",
  "coverage": 0.73
}

---

Eval protocol

• Use bilingual sets from code_switching_eval.md.
• For each query, add a romanized twin and at least one brand alias variant.
• Report ΔS, coverage, λ on three paraphrases and two seeds.
• Accept only if: ΔS ≤ 0.45, coverage ≥ 0.70, λ convergent, no harmful reranker flips.
• Keep per language family the same reranker window size.

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When to escalate

• ΔS stays ≥ 0.60 even after fusion tuning → revisit analyzer routing and re-chunk, open query_routing_and_analyzers.md and retrieval-playbook.md.
• Instability appears only in long chains → treat as reasoning drift, open logic-collapse.md and add a BBCR bridge.

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Copy paste prompt for the LLM step

You have TXTOS and WFGY Problem Map loaded.

Task:
1) For {query, lang, script}, choose hybrid weights deterministically.
2) Run cite-then-explain. Protect snippets that already meet ΔS ≤ 0.45.
3) Return a JSON trace:
{ "w_bm25": 0.xx, "w_dense": 0.xx, "ΔS": 0.xx, "coverage": 0.xx, "λ_state": "→|←|<>|×", "protected_ids": [...] }
Keep it auditable and short.

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