WFGY/ProblemMap/GlobalFixMap/Language/stopword_and_morphology_controls.md

Stopword and Morphology Controls · Global Fix Map

Lock language specific stopwords and morphology so retrieval remains stable across scripts and locales. Protect entities from stopword removal, version your lemmatizer, and verify with ΔS, λ, and coverage targets.

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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
• Bilingual eval sets → code_switching_eval.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 inflected forms and lemmas
• Removing stopwords never drops a required entity or negation token
• Rank@k does not regress more than 2 points after morphology changes

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What usually breaks

Symptom	Likely cause	Open this
Named entities vanish after preprocessing	stopword list removes particles that are part of names	proper_noun_aliases.md
Wrong meaning for negated statements	stopword filter removes “not” class tokens	retrieval-traceability.md
Duplicate docs across lemma and surface form	inconsistent stemming across index and query	tokenizer_mismatch.md
CJK recall collapses after adding stopwords	imported Latin stopword list applied to CJK	script_mixing.md
Turkish i and ı behave inconsistently	locale fold differs across stages	locale_drift.md
Romanized queries fail while native works	alias view absent and morphology applied only to native	romanization_transliteration.md

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Language family controls

Latin and Germanic

• Case fold with locale aware rules.
• Use light stemming or lemmatization, not both.
• Keep negation terms out of stopwords. Maintain a protected list.

Romance

• Normalize accents consistently.
• Prefer lemmatization for verbs and nouns.
• Maintain a protected list for names with articles or particles.

CJK

• Do not apply generic stopword lists.
• Use bigram or language specific tokenizers.
• Keep entities in dedicated fields without stopword removal.

Semitic RTL

• Normalize diacritics and width consistently.
• Use lemmatization that preserves roots only if evaluation passes ΔS and coverage.
• Keep a protected list for clitics that change meaning.

Indic

• Avoid generic lists from other languages.
• Use language specific analyzers and verify with bilingual eval.
• Protect named entities that share forms with common words.

Cyrillic and Greek

• Apply accent and width normalization.
• Prefer lemmatization over aggressive stemming.
• Maintain a protected entity list for inflected forms.

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Deterministic pipeline checklist

1. Version every component: stoplist_v, stemmer_v, lemma_v, normalize_v.
2. Define no stop zones for entity fields and citation fields.
3. Keep words filter with a protected list per language code.
4. Apply normalization before morphology, not after.
5. Use the same pipeline for indexing and querying.
6. Log a morphology fingerprint in traces and eval reports.

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Copy snippets

A. Protected term filter sketch

{
  "analysis": {
    "filter": {
      "keep_entities_en": {
        "type": "keep",
        "keep_words": ["New York", "AT&T", "Côte d'Ivoire", "Íñigo", "İstanbul"]
      }
    }
  }
}

B. Minimal morphology config record

{
  "language": "tr",
  "stoplist_v": "tr_core_1.2",
  "lemma_v": "tr_lemma_0.9",
  "normalize_v": "nfkc_fold_tr",
  "no_stop_fields": ["title_exact", "entity_exact"],
  "protected_list_hash": "sha256:..."
}

C. Trace fields to log

{
  "ΔS": 0.42,
  "λ_state": "<>",
  "coverage": 0.74,
  "language": "ar",
  "morph_fingerprint": "stop:ar_1.1|lemma:ar_0.8|norm:nfkc_1.0|keep:hash"
}

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Eval protocol

• Use bilingual and code switching sets from code_switching_eval.md.
• For each query, test with and without stopword removal and with two morphology settings.
• Accept only if ΔS ≤ 0.45, coverage ≥ 0.70, λ convergent, and no loss of entity recall.
• Report Rank@k deltas for lemma vs surface forms.

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When to escalate

• ΔS stays ≥ 0.60 after morphology and stopword tuning → revisit analyzer routing and re chunking, see query_routing_and_analyzers.md and retrieval-playbook.md.
• Good top k but citations inconsistent → enforce schema and fix at the prompting layer, see retrieval-traceability.md and data-contracts.md.

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Copy paste prompt for the LLM step

You have TXTOS and the WFGY Problem Map loaded.

Task:
1) For {lang, script}, choose stopword and morphology settings that protect entities and negation.
2) Run cite then explain. If ΔS(question, retrieved) ≥ 0.60, propose the minimal structural fix.
3) Return JSON:
{ "stoplist_v": "...", "lemma_or_stem": "lemma|stem|none", "protected_terms": [...], "ΔS": 0.xx, "coverage": 0.xx, "λ_state": "→|←|<>|×" }
Keep it auditable and short.

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