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pith:IOVTADSA

pith:2026:IOVTADSAIQNRQIZOM5ICML5RTE

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Reward Score Matching: Unifying Reward-based Fine-tuning for Flow and Diffusion Models

Jeongjae Lee, Jeongsol Kim, Jinho Chang, Jong Chul Ye

Many reward-based fine-tuning methods for diffusion and flow models reduce to a single score-matching objective against a value-guided target.

arxiv:2604.17415 v3 · 2026-04-19 · cs.LG · cs.AI · cs.CV

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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

Although existing methods are derived from different perspectives, we show that many can be written under a common framework, which we call reward score matching (RSM).

C2weakest assumption

That the primary distinctions among existing methods reduce to the construction of the value-guidance estimator and the effective optimization strength across timesteps, without material loss of generality or overlooked auxiliary mechanisms.

C3one line summary

Reward Score Matching unifies reward-based fine-tuning for flow and diffusion models by recasting alignment as score matching to a value-guided target.

Cited by

1 paper in Pith

Improved techniques for fine-tuning flow models via adjoint matching: a deterministic control pipeline

Receipt and verification

First computed	2026-06-02T01:03:47.239586Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

43ab300e40441b18232e6750262fb19903d11d9b06c5390de10b5769fee83e8f

Aliases

arxiv: 2604.17415 · arxiv_version: 2604.17415v3 · doi: 10.48550/arxiv.2604.17415 · pith_short_12: IOVTADSAIQNR · pith_short_16: IOVTADSAIQNRQIZO · pith_short_8: IOVTADSA

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/IOVTADSAIQNRQIZOM5ICML5RTE \
  | 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: 43ab300e40441b18232e6750262fb19903d11d9b06c5390de10b5769fee83e8f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "965112703ecf90a21ea7fa74bb4649f763107130cbece4ac12a9ddcc00b3251d",
    "cross_cats_sorted": [
      "cs.AI",
      "cs.CV"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LG",
    "submitted_at": "2026-04-19T12:47:52Z",
    "title_canon_sha256": "a9b9c9999d2b319856cd98f141b6c5316e3159c1ff90fcf1fc01e0069613e15f"
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  "source": {
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    "kind": "arxiv",
    "version": 3
  }
}