Pith Number

pith:G35DKJFZ

pith:2009:G35DKJFZLME3U4C673752TEVQ7

not attested not anchored not stored refs pending

Taking Advantage of Sparsity in Multi-Task Learning

Alexandre B. Tsybakov, Karim Lounici, Massimiliano Pontil, Sara van de Geer

arxiv:0903.1468 v1 · 2009-03-09 · stat.ML · math.ST · stat.TH

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{G35DKJFZLME3U4C673752TEVQ7}

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.

Receipt and verification

First computed	2026-05-18T03:48:34.631281Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

36fa3524b95b09ba705efeffdd4c9587f29ac5a6f6646b905d893254db89782e

Aliases

arxiv: 0903.1468 · arxiv_version: 0903.1468v1 · doi: 10.48550/arxiv.0903.1468 · pith_short_12: G35DKJFZLME3 · pith_short_16: G35DKJFZLME3U4C6 · pith_short_8: G35DKJFZ

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/G35DKJFZLME3U4C673752TEVQ7 \
  | 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: 36fa3524b95b09ba705efeffdd4c9587f29ac5a6f6646b905d893254db89782e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b241696756d2b73857b3e3e3375bebe9eb555c5ec2f7881758729fff43832a53",
    "cross_cats_sorted": [
      "math.ST",
      "stat.TH"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "stat.ML",
    "submitted_at": "2009-03-09T00:54:46Z",
    "title_canon_sha256": "1d3b9e933af409c4ddf6dccc9a9592f31593df3ca9b4c3eb0ef6652cf6cf51bb"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0903.1468",
    "kind": "arxiv",
    "version": 1
  }
}