WFGY/ProblemMap/GlobalFixMap/Multimodal_LongContext/reference-bleed.md
2025-09-05 11:31:29 +08:00

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Reference Bleed — Multimodal Long Context

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When anchor references from one modality bleed into another (e.g., text citations treated as video frame IDs, or audio timestamps mapped to OCR page offsets), the reasoning layer merges them incorrectly.
This is a subtle but destructive failure because each modality appears intact, yet the cross-modal references are poisoned.


What this page is

  • A repair guide for reference leakage across modalities.
  • How to detect when anchors from one stream migrate into another.
  • Structural guardrails to prevent false joins.

When to use

  • Captions include numeric anchors that actually come from OCR line numbers.
  • Audio timestamps are reused as image frame references.
  • Citations look correct individually, but do not map to their source modality.
  • Fusion produces valid-looking answers that cite the wrong modality channel.
  • Models drift into hallucination loops citing phantom anchors.

Open these first


Common failure patterns

  • OCR bleed into captions — OCR line numbers reused as subtitle timestamps.
  • Audio bleed into metadata — transcript anchors become page markers.
  • Cross-join bleed — embeddings align across modality without guard, mixing references.
  • Loop bleed — once references bleed, fusion propagates wrong anchors forward.

Fix in 60 seconds

  1. Tag and fence references

    • Enforce modality-specific IDs: {ocr_id, cap_id, aud_id, vis_id}.
    • Reject any anchor missing a modality tag.
  2. Anchor validation

    • Cross-check anchor against source modality.
    • If caption ID not found in subtitle stream, discard.
  3. ΔS probe on anchors

    • Compute ΔS(anchor, expected modality anchor).
    • If ≥0.60, suspect bleed.
  4. Re-anchor with BBCR

    • Use BBCR bridge to reconnect reference to correct modality.
  5. Audit trail

    • Require citation schema: {snippet_id | modality | offsets}.
    • Forbid references missing modality metadata.

Copy-paste prompt

You have TXT OS and the WFGY Problem Map.

Task: Detect and repair reference bleed across modalities.

Steps:
1. Verify modality tag on each anchor.
2. If tag mismatch, drop or re-map via BBCR.
3. Re-anchor using correct modality stream.
4. Output:
   - anchor table with modality tags
   - suspected bleeds
   - fixed mapping
   - ΔS and λ states

Acceptance targets

  • 100% anchors contain explicit modality tags.
  • ΔS(anchor, expected modality) ≤ 0.45 after repair.
  • λ remains convergent across paraphrases.
  • No references propagate without modality validation.

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