jayyun98/Humanizer-12B-Draftfit-DFlash2

Draftfit · Humanizer 12B DFlash2

A validation checkpoint for Draftfit — train DFlash-family drafts jointly, convert compatible families, and continue training existing drafts.

This DFlash2 draft accelerates Humanizer; it requires the target model.

Target / teacher: Humanizer. Initial draft weights: Gemma4 DFlash. This is a target-specific speculative draft, not a standalone Humanizer fine-tune.

Performance

Model	tok/s	Acceptance	vs. original
Target only	21.71	—	—
Original DFlash	23.43	30.1%	reference
Draftfit DSpark	33.49	59.9%	+42.9%
Draftfit DFlash	32.62	59.9%	+39.2%
Draftfit DFlash2	31.23	55.6%	+33.3%

By domain · tok/s

Model	General prose	Blog	Email	Report	Essay
Target only	21.52	21.51	21.44	22.00	21.79
Original DFlash	25.22	24.38	23.75	22.01	22.98
Draftfit DSpark	33.59	39.29	33.54	31.77	30.93
Draftfit DFlash	32.92	38.81	32.80	29.75	29.13
Draftfit DFlash2	33.16	35.81	30.46	31.14	29.48

Apple M5 Pro · MLX · mixed 4/8-bit target with FP32 floating computation · 4-bit drafts. Median throughput includes prefill and verification; acceptance is accepted/proposed draft tokens. Same 10 held-out inputs ×2 repeats per model, greedy, up to 64 output tokens, draft cap 3, lookup off. All 160 requests matched target-only tokens, including previous-checkpoint comparisons.

Continued drafts improved median throughput by 2.6–4.9% over their previous checkpoints in this run; trial variability is substantial, so this is not a robust or long-form speedup claim. Domain acceptance, previous checkpoints and details.

Acceptance by draft position

Model	Position 1	Position 2	Position 3
Original DFlash	52.8%	26.6%	10.5%
Draftfit DSpark	80.6%	59.4%	39.3%
Draftfit DFlash	80.6%	59.4%	39.3%
Draftfit DFlash2	74.0%	57.1%	35.5%

Same MLX runs above. Position k = accepted prefixes reaching k / rounds proposing position k. Earlier rejection also rejects later positions; these are not conditional token accuracies. Counts and domain breakdown.

How to use

MLX — tested. After runtime setup, pass prose to rewrite:

hf download jayyun98/Humanizer-12B-Draftfit-DFlash2 run_mlx.py --local-dir ./humanizer-draft
python ./humanizer-draft/run_mlx.py --text "The meeting has been moved to Friday." --check

vLLM / SGLang — unverified for this checkpoint. No CUDA serving or speed claim; use the tested MLX path.

Basic precision showed occasional token differences; the supplied runner uses the tested FP32 setting. Provenance · Apache-2.0 · DFlash MIT · Attribution.