Pith Number

pith:72DMSKXS

pith:2025:72DMSKXS37MPOQ5G5TK5TEAJQJ

not attested not anchored not stored refs pending

Jacobian Sparse Autoencoders: Sparsify Computations, Not Just Activations

Conor Houghton, Laurence Aitchison, Lucy Farnik, Tim Lawson

arxiv:2502.18147 v2 · 2025-02-25 · cs.LG · cs.AI · cs.CL

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{72DMSKXS37MPOQ5G5TK5TEAJQJ}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

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.

Cited by

4 papers in Pith

WriteSAE: Sparse Autoencoders for Recurrent State

Receipt and verification

First computed	2026-07-05T11:16:55.543444Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fe86c92af2dfd8f743a6ecd5d990098260c280a222ac12e041ce5de818c59e59

Aliases

arxiv: 2502.18147 · arxiv_version: 2502.18147v2 · doi: 10.48550/arxiv.2502.18147 · pith_short_12: 72DMSKXS37MP · pith_short_16: 72DMSKXS37MPOQ5G · pith_short_8: 72DMSKXS

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/72DMSKXS37MPOQ5G5TK5TEAJQJ \
  | 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: fe86c92af2dfd8f743a6ecd5d990098260c280a222ac12e041ce5de818c59e59

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "012289f616f101db1b6d696fb059db9dfa1b29f6171bf5fe99ed4e9ee08f8018",
    "cross_cats_sorted": [
      "cs.AI",
      "cs.CL"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.LG",
    "submitted_at": "2025-02-25T12:21:45Z",
    "title_canon_sha256": "332d8e91756b32f79c555637e4964b41a5058c9477bd007b530e0b5e31e65134"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2502.18147",
    "kind": "arxiv",
    "version": 2
  }
}