Pith Number

pith:DDQNQ3VK

pith:2012:DDQNQ3VK4MBOH65EXFAGMATST2

not attested not anchored not stored refs pending

Spectral dimensionality reduction for HMMs

Dean P. Foster, Jordan Rodu, Lyle H. Ungar

arxiv:1203.6130 v1 · 2012-03-28 · stat.ML · cs.LG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{DDQNQ3VK4MBOH65EXFAGMATST2}

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	2026-05-18T03:59:04.095608Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

18e0d86eaae302e3fba4b9406602729e9b7aa4e0666fb6e5c5148e504b251ca6

Aliases

arxiv: 1203.6130 · arxiv_version: 1203.6130v1 · doi: 10.48550/arxiv.1203.6130 · pith_short_12: DDQNQ3VK4MBO · pith_short_16: DDQNQ3VK4MBOH65E · pith_short_8: DDQNQ3VK

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/DDQNQ3VK4MBOH65EXFAGMATST2 \
  | 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: 18e0d86eaae302e3fba4b9406602729e9b7aa4e0666fb6e5c5148e504b251ca6

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "14c5b28118e32a5ee9ee0fed18e9a7d3cff25e326620121c2968663b51f4475c",
    "cross_cats_sorted": [
      "cs.LG"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "stat.ML",
    "submitted_at": "2012-03-28T01:56:32Z",
    "title_canon_sha256": "c851857805499c0e834225eb1b64e4ec8d5e996a2abcb9e6617cca263f01adce"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1203.6130",
    "kind": "arxiv",
    "version": 1
  }
}