Pith Number

pith:6GRWJT5Y

pith:2026:6GRWJT5YACCEET7O63TU7KTVBV

not attested not anchored not stored refs pending

Spark3R: Asymmetric Token Reduction Makes Fast Feed-Forward 3D Reconstruction

Haijie Li, Jian Zhang, Jiaqi Zhang, Jiaye Fu, Qiankun Gao, Siwei Ma, Yanmin Wu, Zecheng Tang

Asymmetric compression of query versus key-value tokens speeds feed-forward 3D reconstruction up to 28 times without retraining.

arxiv:2605.06270 v2 · 2026-05-07 · cs.CV

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\usepackage{pith}
\pithnumber{6GRWJT5YACCEET7O63TU7KTVBV}

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Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Claims

C1strongest claim

Spark3R achieves up to 28× speedup on 1,000-frame inputs while maintaining competitive reconstruction quality by decoupling the compression of query tokens and key-value tokens with intra-group merging and lightweight pruning.

C2weakest assumption

That query tokens encode view-specific geometric requests sensitive to compression while key-value tokens represent shared scene context tolerant to aggressive compression, and that this functional distinction generalizes across pretrained models and input sequences without retraining.

C3one line summary

Asymmetric token reduction, with distinct merging for queries and pruning for key-values plus layer-wise adaptation, delivers up to 28x speedup on 1000-frame 3D reconstruction inputs while preserving competitive quality.

Receipt and verification

First computed	2026-05-20T01:05:15.580584Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f1a364cfb80084424feef6e74faa750d4352b8eba4eca8562a796148763f3f21

Aliases

arxiv: 2605.06270 · arxiv_version: 2605.06270v2 · doi: 10.48550/arxiv.2605.06270 · pith_short_12: 6GRWJT5YACCE · pith_short_16: 6GRWJT5YACCEET7O · pith_short_8: 6GRWJT5Y

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/6GRWJT5YACCEET7O63TU7KTVBV \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: f1a364cfb80084424feef6e74faa750d4352b8eba4eca8562a796148763f3f21

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bca6ad25013db74fa5f3ca07a1af9b3f14b36d4f9f5c2b1c4828dc4add42e335",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by-sa/4.0/",
    "primary_cat": "cs.CV",
    "submitted_at": "2026-05-07T13:45:37Z",
    "title_canon_sha256": "e4392de7f8550d57ae5355fcfd2f370b2d111f19fda7e6ebb29670ab8b1a43d5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.06270",
    "kind": "arxiv",
    "version": 2
  }
}