RUMA V2

RUMA = Routed Updatable Memory Architecture

License: Apache 2.0
Status: V2 architecture-family release

What This Release Is

RUMA V2 is an interleaved routed updatable memory architecture family for:

• explicit updates
• retained guidance
• stale-memory suppression
• grounded evidence control

This release is meant to be read as a serious small-model and architecture-family package, not as a frontier-model claim.

What This Release Claims

• interleaved RUMA blocks can function as a real model-architecture component
• RUMA remains strong on official edit tasks and bounded standalone stabilization tasks
• the broader controller-based package is strong on FEVER, HotpotQA, external versioned documents, and the bounded BEIR subset bridge
• broader standalone text behavior is partially real, with a public reference backbone optimized for grounded controller behavior and a comparison backbone that improves small-model text retention

What This Release Does Not Claim

• a broad standalone foundation model
• a permanently settled backbone comparison
• a general solution to hallucination
• a universal replacement for standard language-model backbones

Headline Results

• CounterFact: RUMA supersession canonical 0.9922, paraphrase 1.0, retention 0.9938
• zsRE: RUMA supersession canonical 0.9609, paraphrase 0.9609, retention 1.0
• bounded standalone stabilization:
  • bounded factual update benchmark: update 1.0, retention 1.0, stale suppression 1.0
  • bounded code-update benchmark: update 1.0, retention 1.0, stale suppression 1.0
  • bounded document-chunk update benchmark: update 1.0, retention 1.0, stale suppression 1.0
• FEVER interleaved controller: evidence recall@5 0.9609, answer hit 0.7656, NEI abstain 0.4531
• HotpotQA interleaved controller: supporting-fact recall@8 0.8005, full support-chain hit@8 0.8359, answer hit 0.5312
• broader standalone text maturity:
  • RUMA with the public reference backbone: update-generation exact 0.5625, retention-generation exact 0.0, old-text suppression 1.0
  • RUMA with the selective state-space comparison backbone: update-generation exact 0.625, retention-generation exact 0.5416, old-text suppression 0.75

Read First

• PREPRINT_V2.md
• RELEASE_NOTES_v0.2.1.md
• sandbox/README.md
• paper_assets/v2_benchmark_package_snapshot.md
• RUMA_V2_FORMAL_SPEC.md
• RUMA_V2_REVERSE_ARCHITECTURE_BLUEPRINT.md

Package Layout

• sandbox/: core model code, benchmark harnesses, and result artifacts
• paper_assets/: release-facing CSV and markdown summary assets
• versioned_manuals/, versioned_manual_updates/, versioned_manual_conflicts/: curated bounded update corpora
• external_corpora/python_ecosystem_changes/: curated external update corpus built from official-source Python ecosystem documents

Canonical V2 Records

• software DOI: 10.5281/zenodo.19655779
• preprint DOI: 10.5281/zenodo.19652555

Historical Note

The earlier narrow systems package remains available as the V1 release path and manuscript in PREPRINT_V1.md. V2 supersedes that package as the main architecture-family release.

Historical V1 archival records:

• software DOI: 10.5281/zenodo.19563634
• preprint DOI: 10.5281/zenodo.19563611

These V1 records are retained for archival continuity. They should not be interpreted as the DOI records for the current V2 release.

Citation

Use CITATION.cff and the release metadata for the public release you are actually citing. The earlier V1 DOI-backed release remains a historical artifact and should not be mistaken for the V2 package.