Pith Number

pith:PWLSA3CR

pith:2025:PWLSA3CRXYWS3I6LKJDKY7HZYL

not attested not anchored not stored refs pending

Sparse Autoencoders Do Not Find Canonical Units of Analysis

Bart Bussmann, Curt Tigges, Joseph Bloom, Lee Sharkey, Michael Pearce, Neel Nanda, Noura Al Moubayed, Patrick Leask

arxiv:2502.04878 v1 · 2025-02-07 · cs.LG · cs.AI

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{PWLSA3CRXYWS3I6LKJDKY7HZYL}

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

15 papers in Pith

Do Sparse Autoencoders Learn Meaningful Concept Hierarchies?

Critical Percolation as a Synthetic Data Model for Interpretability

Surrogate Fidelity: When Can Open LLMs Explain Closed Ones?

Size Doesn't Matter: Cosine-Scored Sparse Autoencoders

Sign-Aware Gated Sparse Autoencoders: Modeling Anticorrelated Features with Bi-Jump-ReLU Activations

Receipt and verification

First computed	2026-07-05T10:10:58.954987Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7d97206c51be2d2da3cb5246ac7cf9c2c30ad9daca29cce414bba745e44c5294

Aliases

arxiv: 2502.04878 · arxiv_version: 2502.04878v1 · doi: 10.48550/arxiv.2502.04878 · pith_short_12: PWLSA3CRXYWS · pith_short_16: PWLSA3CRXYWS3I6L · pith_short_8: PWLSA3CR

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/PWLSA3CRXYWS3I6LKJDKY7HZYL \
  | 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: 7d97206c51be2d2da3cb5246ac7cf9c2c30ad9daca29cce414bba745e44c5294

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5408f3d05f176c228d4b5901896fd743ced755050cbc553b66ea40b45aa6510d",
    "cross_cats_sorted": [
      "cs.AI"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.LG",
    "submitted_at": "2025-02-07T12:33:08Z",
    "title_canon_sha256": "3c106e5b88405707b6604c676d4120f602c2c6197a9a137c573d79f576d139f4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2502.04878",
    "kind": "arxiv",
    "version": 1
  }
}