WFGY/ProblemMap/GlobalFixMap/Multimodal_LongContext/boundary-fade.md

Boundary Fade — Guardrails and Fix Pattern

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• Multimodal_LongContext — long-context reasoning across text, vision, and audio
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When multimodal long-context windows extend, boundaries between modalities or section joins blur.
This causes models to conflate captions, transcripts, or visuals across neighboring regions, producing hybrid outputs or lost anchors.

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Symptoms of Boundary Fade

• Captions merge into adjacent paragraphs, citations drift by a few lines.
• Visual snippets spill across sections, losing clear demarcation.
• ΔS across joins rises above 0.50, meaning semantic leakage.
• Output shows partial traces of two anchors instead of one.
• “Memory fade” across session restarts, context joins feel smeared.

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Open these first

• Join stability and chunk fences: Chunking Checklist
• Attention variance and entropy melt: Entropy Collapse
• Context drift at long horizon: Context Drift
• Visual trace schema: Cross-Modal Trace
• Session state guards: Memory Coherence

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Fix in 60 seconds

1. Measure joins

   • Compute ΔS across each modality join. Threshold ≤ 0.50.
   • If higher, suspect boundary fade.

2. Enforce fences

   • Insert {section_start} and {section_end} markers explicitly.
   • Require mod_type label (e.g., [image], [caption], [audio]).

3. Stabilize variance

   • Apply BBAM clamp when variance spikes near joins.
   • Use BBCR bridge to redirect reasoning back to the intended anchor.

4. Audit output

   • Each snippet must map to a single anchor ID.
   • Reject blended outputs that merge two snippet IDs.

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Acceptance Targets

• ΔS(question, retrieved) ≤ 0.45 overall.
• ΔS across joins ≤ 0.50.
• λ_observe convergent across three paraphrases.
• No section bleed: one snippet → one anchor only.

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Copy-paste prompt

You are running TXTOS + WFGY Problem Map.

Symptom: section or modality boundaries blur (“boundary fade”).

Protocol:
1. Compute ΔS across joins, enforce ≤ 0.50.
2. Insert section_start and section_end markers.
3. Require mod_type labels for all snippets.
4. Apply BBAM clamp, BBCR bridge if joins collapse.
5. Verify each snippet maps to exactly one anchor ID.

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Explore More

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Engine	WFGY 2.0	Production tension kernel and math engine for RAG and agents
Engine	WFGY 3.0	TXT based Singularity tension engine, 131 S class set
Map	Problem Map 1.0	Flagship 16 problem RAG failure checklist and fix map
Map	Problem Map 2.0	RAG focused recovery pipeline
Map	Problem Map 3.0	Global Debug Card, image as a debug protocol layer
Map	Semantic Clinic	Symptom to family to exact fix
Map	Grandma’s Clinic	Plain language stories mapped to Problem Map 1.0
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App	TXT OS	TXT semantic OS, fast boot
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