Pith Number

pith:DOC2W33D

pith:2026:DOC2W33DYIXD2HMVKQ2JH6URI4

not attested not anchored not stored refs pending

From Tokens to Concepts: Leveraging SAE for SPLADE

Basile Van Cooten, Benjamin Piwowarski, Laure Soulier, Mathias Vast, Yuxuan Zong

Replacing the token vocabulary in SPLADE with semantic concepts from Sparse Auto-Encoders yields comparable retrieval performance with improved efficiency.

arxiv:2604.21511 v2 · 2026-04-23 · cs.IR · cs.CL

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\pithnumber{DOC2W33DYIXD2HMVKQ2JH6URI4}

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Record completeness

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2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

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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

Our experiments demonstrate that SAE-SPLADE achieves retrieval performance comparable to SPLADE on both in-domain and out-of-domain tasks while offering improved efficiency.

C2weakest assumption

That the SAE-learned latent concepts form a drop-in replacement for the original token vocabulary without losing retrieval-critical information and that the two training regimes remain compatible.

C3one line summary

SAE-SPLADE substitutes SPLADE's backbone vocabulary with SAE-derived semantic concepts and matches standard SPLADE performance with better efficiency on in- and out-of-domain tasks.

Receipt and verification

First computed	2026-06-02T02:04:17.954944Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1b85ab6f63c22e3d1d95543493fa914733aa2d06286a87aea8c6089003d1160a

Aliases

arxiv: 2604.21511 · arxiv_version: 2604.21511v2 · doi: 10.48550/arxiv.2604.21511 · pith_short_12: DOC2W33DYIXD · pith_short_16: DOC2W33DYIXD2HMV · pith_short_8: DOC2W33D

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/DOC2W33DYIXD2HMVKQ2JH6URI4 \
  | 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: 1b85ab6f63c22e3d1d95543493fa914733aa2d06286a87aea8c6089003d1160a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ffae18e1b962fb77c3230abd25ca467a39cec0e27ba076f53d55e1817feea78d",
    "cross_cats_sorted": [
      "cs.CL"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.IR",
    "submitted_at": "2026-04-23T10:13:21Z",
    "title_canon_sha256": "7809308bf8450041565e2d0a7719fe8b061d5246c5ff381f71c54341c0780830"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.21511",
    "kind": "arxiv",
    "version": 2
  }
}