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

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# Boundary Fade — Guardrails and Fix Pattern
<details>
<summary><strong>🧭 Quick Return to Map</strong></summary>
<br>
> You are in a sub-page of **Multimodal_LongContext**.
> To reorient, go back here:
>
> - [**Multimodal_LongContext** — long-context reasoning across text, vision, and audio](./README.md)
> - [**WFGY Global Fix Map** — main Emergency Room, 300+ structured fixes](../README.md)
> - [**WFGY Problem Map 1.0** — 16 reproducible failure modes](../../README.md)
>
> Think of this page as a desk within a ward.
> If you need the full triage and all prescriptions, return to the Emergency Room lobby.
</details>
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.
---
## 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.
---
## Open these first
- Join stability and chunk fences: [Chunking Checklist](../MemoryLongContext/chunking-checklist.md)
- Attention variance and entropy melt: [Entropy Collapse](../MemoryLongContext/entropy-collapse.md)
- Context drift at long horizon: [Context Drift](../MemoryLongContext/context-drift.md)
- Visual trace schema: [Cross-Modal Trace](./cross-modal-trace.md)
- Session state guards: [Memory Coherence](../MemoryLongContext/memory-coherence.md)
---
## 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.
---
## 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.
---
## Copy-paste prompt
```txt
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.
````
---
### 🔗 Quick-Start Downloads (60 sec)
| Tool | Link | 3-Step Setup |
| -------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------ | ---------------------------------------------------------------------------------------- |
| **WFGY 1.0 PDF** | [Engine Paper](https://github.com/onestardao/WFGY/blob/main/I_am_not_lizardman/WFGY_All_Principles_Return_to_One_v1.0_PSBigBig_Public.pdf) | 1⃣ Download · 2⃣ Upload to your LLM · 3⃣ Ask “Answer using WFGY + \<your question>” |
| **TXT OS (plain-text OS)** | [TXTOS.txt](https://github.com/onestardao/WFGY/blob/main/OS/TXTOS.txt) | 1⃣ Download · 2⃣ Paste into any LLM chat · 3⃣ Type “hello world” — OS boots instantly |
---
<!-- WFGY_FOOTER_START -->
### Explore More
| Module | Description | Link |
| --- | --- | --- |
| WFGY Core | Canonical framework entry point | [View](https://github.com/onestardao/WFGY/tree/main/core/README.md) |
| Problem Map | Diagnostic map and navigation hub | [View](https://github.com/onestardao/WFGY/tree/main/ProblemMap/README.md) |
| Tension Universe Experiments | MVP experiment field | [View](https://github.com/onestardao/WFGY/tree/main/TensionUniverse/Experiments) |
| Recognition | Where WFGY is referenced or adopted | [View](https://github.com/onestardao/WFGY/blob/main/recognition/README.md) |
| AI Guide | Anti-hallucination reading protocol for tools | [View](https://github.com/onestardao/WFGY/blob/main/AI_GUIDE.md) |
> If this repository helps, starring it improves discovery for other builders.
> [![GitHub Repo stars](https://img.shields.io/github/stars/onestardao/WFGY?style=social)](https://github.com/onestardao/WFGY)
<!-- WFGY_FOOTER_END -->