rapid-moss: MOSS-Image-SFT 4-step adapter (data-space DMD â DMAD)
English summary. A 4-step, CFG-free adapter for OpenMOSS-Team/MOSS-Image-SFT
(50 steps à 2 forwards with CFG 3). It continues lodestones/MOSS-Image-SFT-8-steps-dmd
(data-space DMD, arXiv 2610.12102) restricted to 4 iterations, trained with DMAD (arXiv 2610.02188): a LoRA critic on the
frozen teacher separates teacher samples from student samples, and the student minimises the negative critic logit.
DiT time per 1024² image on one H100: 16.2 s (teacher) â 0.81 s. Compared with the lodestones checkpoint run for 4 steps,
images have more detail and livelier composition, with some regressions (see Results). Same file format and sampler as the
lodestones checkpoint; inference.py runs it with the release pipeline. Training code is in code/.
MOSS-Image-SFT(50 ã¹ãããã»CFG 3 ã§ 1 æ 100 åã® DiT èšç®)ãã4 åã®èšç®ã»CFG ãªãã§ç»åãåºããããã«ããé«éåã¢ããã¿ã§ãã lodestones ã® 8 ã¹ãããç(data-space DMDãupdate 2600)ãåºçºç¹ã«ã4 ã¹ãããã«çµã£ãŠ DMAD ã§è¿œå åŠç¿ããŸããã
| DiT æé / 1024² 1 æ(H100) | DiT ã®èšç®åæ° | |
|---|---|---|
| MOSS-Image-SFT(50 stepãCFG 3ãè² åŽ block 22 skip) | 16.2 s | 100 |
| lodestones 8 step | 1.54 s | 8 |
| ãã®ã¢ããã¿(4 step) | 0.81 s | 4 |
(DiT ã®ã¿ã®èšæž¬ãããã¹ããšã³ã³ãŒããš VAE ã¯å«ãŸãªããå®è£
㯠code/rapid_moss/model.pyã)
äœ¿ãæ¹
pip install "diffusers>=0.38" "transformers>=5.3" accelerate safetensors huggingface_hub pillow
python inference.py --prompt "an anime girl in a yellow raincoat at a rainy bus stop at night" --width 1024 --height 1024 --out out.png
ãã¡ã€ã«ã¯ lodestones ãšåã圢åŒã§ãã
| ãã¡ã€ã« | äžèº« |
|---|---|
lora.safetensors |
fp32 LoRAãrank 128 / alpha 128ãå
š 42 ãããã¯ã® proj.{q,k,v,o,ffn_up_gate,ffn_down}ãkohya 圢åŒã®ããŒ(diffusion_model.<module>.lora_down.weight / lora_up.weight / alpha) |
time_embedding.safetensors |
fp32 ã® time_embedding.* ãš shared_block_modulation.bias / video_head_modulation.bias ã®çœ®ãæã |
dataspace.safetensors |
latent_mix.Q [128, 128] ãš step_codes [1000, 968, 926, 871] |
ãµã³ãã©ãŒ(ãã€ãºã®åæ³šå ¥ãã¿ã€ã ã¹ãããã®ã¹ã±ãžã¥ãŒã«ããªããåã z ã䜿ãç¶ãã):
x0 = torch.zeros_like(z) # z: fp32 noise [1, 128, H/16, W/16]
for r in range(4): # 1ã3 åã§æ¢ããŠãç»åã«ãªã(åæ®µéãåŠç¿ããŠãã)
x = z + torch.einsum("oc,bchw->bohw", Q, x0)
x0 = z - transformer(x, codes[r], prompt_embeds, prompt_mask).sample.float()
# x0 ã release ã® VAE ã§ãã³ãŒã(BN ã®éæ£èŠå + 2x2 unpatchify)
LoRA ã®é©ç𿹿³ãCFGãè§£å床ãªã©ã®æ±ºãŸãã¯ãäžã®ã泚æç¹ããèªãã§ãã ããã
ComfyUI
ã«ã¹ã¿ã ããŒã comfyui/rapid-moss/ ã忢±ããŠããŸããComfyUI æ¬äœã MOSS-Image ã«å¯Ÿå¿ããŠããŸãããå°çšãµã³ãã©ãŒãš time path ã®çœ®ãæãã¯ãªããæšæºã® LoraLoaderModelOnly 㯠LoRA ã bf16 ã®éã¿ã«è¶³ã蟌ã¿ãŸã(åœããå·®åã®çžå¯Ÿèª€å·® 81%)ãæšæºããŒãã ãã§ãçµµã¯åºãŸãããåŠç¿ããçæåšãšã¯å¥ç©ã«ãªããŸã(äžã®æ¯èŒ)ããã®ããŒãã䜿ã£ãŠãã ããã
ComfyUI æšæºããŒããŒã«ã察å¿ããŠããŸãã comfyui/rapid-moss/example_workflows/rapid-moss-4step-native.json ã䜿ããLoad Diffusion Model ã§ moss_image_sft_bf16.safetensorsãLoad CLIP ã§ Qwen3.5-9B (type: moss_image)ãLoad VAE ã§ FLUX.2 VAE ãéžãã§ãã ããããã®æ§æã§ã¯ OpenMOSS ã® HF ããŒããŒããŒãã¯äžèŠã§ããæ°ãã ComfyUI ã§åºãŠãã aimdo memory compile error(2026-10-19 ä¿®æ£)ãšãQKV ãçµåãããã¢ãã«ã§åºãŠãã ModuleDict ... has no attribute q ã¯ãããŒããæŽæ°ãããšçŽããŸãã
åŸæ¥ã® HF ããŒããŒã䜿ãå Žå:
- MOSS-Image å
¬åŒããŒã(OpenMOSS/MOSS-Image ã®
comfyui/moss-image/)ãå ¥ããŸãã - ãã®ãªããžããªã®
comfyui/rapid-moss/ãComfyUI/custom_nodes/rapid-moss/ã«ã³ããŒããŸãã - äžã® 3 ãã¡ã€ã«ã
ComfyUI/models/rapid_moss/rapid-moss-4step/ã«çœ®ããŸãã comfyui/rapid-moss/example_workflows/rapid-moss-4step.jsonãç»é¢ã«ãã©ãã°&ããããããHF Loader ã®model_pathã MOSS-Image-SFT ã®ãã©ã«ãã«ããŠå®è¡ããŸãã
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- LoRA ãéã¿ã«ããŒãžãããå·®åãšããŠè¶³ã(æšæºããŒããŒã§ã¯åŠç¿ã³ãŒãã®ãµã³ãã©ãŒãšåã bf16ãHF ããŒããŒã§ã¯ fp32)
- time path ã fp32 ã«çœ®ãæãã(æšæºããŒããŒã§ã¯å€èª¿ãšæ®å·®ã fp32)
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泚æç¹
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- å
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x = z + Q·x0ãx0 = z â vã 4 åç¹°ãè¿ããtimestep ã«ã¯step_codesãæž¡ããŸãã- Euler ãªã©ã®æšæºãµã³ãã©ãŒããéåžžã®ã¹ã±ãžã¥ãŒã©(shift 5 ãªã©)ã¯ãåŠç¿ããçµè·¯ã§ã¯ãããŸãããComfyUI ã®æšæºããŒã(LoRA ããŒã㌠+ KSampler euler)ã§ãçµµã¯åºãŸãããå šäœã玫ããããç·ãæããããªããŸãã
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- ããã³ãã: MOSS-Image ãšåãã§ã(èªç¶æãã¿ã°åãJSON ã¬ã€ã¢ãŠã)ã
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- VRAM:
inference.pyãš ComfyUI ã® HF ããŒããŒã§ã¯ãbase ã«å ããŠçŽ 1.5 GB 䜿ããŸããfp32 ã® LoRA ã 1.19 GBãfp32 ã® time path ãš modulation ãçŽ 0.34 GB ã§ããComfyUI ã®æšæºããŒããŒã§ã¯çŽ 0.65 GB(bf16 ã® LoRA ãš fp32 ã® time path)ã§ãã
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- åå¡ãã»çµµç»èª¿ã®çµµã«ãé Œãã§ããªãé¡åãæŒ¢åãå ¥ãããšããããŸããlodestones ã® 8 ã¹ãããçããåŒãç¶ãã çã§ãteacher ã¯å ¥ããŸããã
- æç°Ÿã»çæ¿ã®å°ããªæåããçœé»æŒ«ç»ã®å¹ãåºãã¯ãæå³ã®éããªãæåã«ãªããããã§ãã
- é Œãã§ããªã人ç©ãå¢ããããšããããŸããJSON ã¬ã€ã¢ãŠãã® 2 ã³ã挫ç»ã§ã¯ãäžã®ã³ãã« 2 人ç®ãåºãŸããã
- lodestones ã® 4 ã¹ãããããæã蟌ã¿ã¯å¢ããŸãããteacher(50 ã¹ããã)ã®çµµç»çãªè³ªæã倿§æ§ã«ã¯å±ããŸããã
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æ€èšŒããŠããªãããš
- ä»ã® LoRA ãšã®çµã¿åãã: ãã£ã©ã¯ã¿ãŒ LoRA ãç»é¢š LoRA ãéãããšãã®æåã¯è©ŠããŠããŸããã4 ã¹ãããåã§å¹ãã匱ãŸãå¯èœæ§ããããŸãã
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lodestones ã® 4 step ãšæ¯ã¹ãæèŠ(ç®èŠã®ã¿ãæ°å€ææšã§ã¯è©äŸ¡ããŠããŸãã):
- è¯ããªã£ãç¹
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- ä»ç®ã® 3 è¡ãçæ¿ãå¹ãåºãã®æ¥æ¬èªã¯æ£ç¢ºãªãŸãŸ
- æªããªã£ãç¹
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- 2 ã³ã挫ç»(JSON ã¬ã€ã¢ãŠã)ã®äžã®ã³ãã« 2 人ç®ãåºã
- æç°Ÿãªã©ã®å°ããªæåã®åŽ©ããå¢ãã
- å€ãããªãç¹
- åå¡ãã®äŸã®çµµã«é Œãã§ããªãé¡åãå ¥ã(lodestones ããåŒãç¶ãã çãteacher ã¯å ¥ããªã)
- çœé»æŒ«ç»ã®å¹ãåºããæå³ã®éããªãæåã«ãªã
çµè«ãšããŠã现éšã¯è¯ããªã£ããäžé·äžçã§ãã
åŠç¿ã®çµé(EMAã4 stepãåã seed)
| init(lodestones) | 300 it | 500 it(å ¬éç) | 800 it |
|---|---|---|---|
- 300 it ã§ã¯ãæ¡ã®å¥³åé«çã®çµµãé¡ã®å¯ãéãã«ãªã厩ããäžåºŠåºãŸããã500 it ã§ã¯å ã«æ»ã£ãŠããŸãã
- 500 â 800 it ã§ã¯ããã³ãããžã®åŸãæ¹(
1girl, soloãªã®ã« 2 人)ãšæåã厩ããŠãããŸããã841ã850 it ã§ NaN ã«ãªããåŠç¿ãæ¢ããŸãããteacher ãµã³ãã«ã«éæéå€ã¯ãªããåå ã¯ç¹å®ã§ããŠããŸãããçŸåšã®ã³ãŒãã¯éæéã®åŸé ã§æŽæ°ãé£ã°ããŸãã - å ¬éç㯠500 it ã® EMA ã§ãã
ææ³
çæåš(data-space iterationãarXiv 2610.12102)
lodestones ã®åœ¢åŒãã®ãŸãŸã§ããx = z + Q·x0, v = net(x, code_r), x0 â z â vã
- åŠç¿å¯Ÿè±¡ã¯ LoRA(rank 128)ãtime path(fp32)ãQ ã® 3 ã€ã§ãã
- lodestones update 2600 ããåæåããstep codes ã¯å é 4 ã€ã䜿ããŸãã
- å埩çªå· r 㯠0ã3 ãé çªã«åããŸããr åç®ãŸã§ã¯åŸé ãªãã§é²ããæåŸã® 1 åã ãåŸé ãæµããŸãã
èå¥åšãšæå€±(DMADãarXiv 2610.02188)
- critic ã®æ§æ: åçµãã teacher(MOSS-Image-SFT ã® bf16)ã«ãblock 21ã41 ã® LoRA(rank 128)ãä»ããŸããblock 41 ã®ç»åããŒã¯ã³ã«ããããä»ãã1 æã«ã€ã 1 ã€ã®ããžãããåºããŸããããã㯠4Ã4 stride-2 conv(3072â512)ãGroupNormãSiLU ã 2 åéãã空éå¹³åãåã£ãŠããç·åœ¢å±€ã«éããŸãã
- critic ã®æå€±:
softplus(âd(teacher ãµã³ãã«)) + softplus(d(çåŸã®åºå))ããã€ãºéã¯ Ï = 5u / (1 + 4u)ãu ~ U[0.02, 0.98] ã§ãteacher ãšçåŸã®çµã§åã Ï ã䜿ããŸãã - çæåšã®æå€±:
âd(ãã€ãºãè¶³ããçåŸã® x0)ãteacher ã® CFG æšè«ã fake score ããåŠç¿äžã¯äœ¿ããŸããã - teacher ãµã³ãã«: 3,199 æã1 ããã³ããã«ã€ã 1 æã§ã50 stepã»CFG 3ã»è² åŽ block 22 skip ã§äœããŸãããè§£å床ã¯çŽ 1MP ã§ãæ£æ¹åœ¢ã»çžŠé·ã»æšªé·ãæ··ããŠããŸããåŠç¿æã®ããã³ããã¯ãã® 3,199 ä»¶ããéžã³ãŸãã
- æ¬ç©ã®ç»åã䜿ããããã¯äœ¿ã£ãŠããŸãã(DMAD 㯠2 ãããã§ããããã¡ã㯠teacher ãããã ã)ã
èšå®
| é ç® | å€ |
|---|---|
| ããã | 16(8 GPU à 2ã1 ãµã³ãã«ãã€é ã«åŠç) |
| çæåš | AdamW lr 2e-5ãbetas (0, 0.99)ãweight decay 0ãEMA 0.998 |
| critic | AdamW lr 4e-5ãbetas (0, 0.99)ãweight decay 0.01ãçæåšãæŽæ°ããªã 50 it ã®ãŠã©ãŒã ã¢ãã |
| å埩 | 500 it(çæåšã®æŽæ° 450 å)ã1 it çŽ 5.7 ç§ |
| èšç®æ© | RunPod 8ÃH100 SXMãteacher ãµã³ãã«çæçŽ 1.9 æéãåŠç¿ 500 it çŽ 47 å |
| è²»çš | 詊éè»¢ãšæ¯èŒå®éšãå«ããŠèšçŽ $126 |
åŠç¿ããã³ãã
24,000 ä»¶(åé åžã¯ããŠããŸãã)ãããteacher ãµã³ãã«ãäœã£ã 3,199 ä»¶ãåŠç¿ã«äœ¿ããŸããã
| çš®é¡ | åºå ž(ã©ã€ã»ã³ã¹) |
|---|---|
| ã¢ãã¡ã®èªç¶æãã£ãã·ã§ã³ | BootsofLagrangian/danbooru-multitier-captions-202606(CC-BY-4.0ãGiyeong Oh)ãCaptionEmporium/anime-caption-danbooru-2021-sfw-5m-hq(CC-BY-SA-4.0) |
| ã¿ã°å | äžèšã® Danbooru ã¿ã°ãFredZhang7/anime-prompts-180K(CreativeML OpenRAIL-M)ã絵垫åã¯é€å» |
| äžè¬ | ProGamerGov/synthetic-dataset-1m-dalle3-high-quality-captions(MIT)ãdata-is-better-together/open-image-preferences-v1(Apache-2.0)ãnateraw/parti-prompts(Apache-2.0) |
| æåæç»(æ¥ 60% / è± 25% / äž 15%)ãJSON ã¬ã€ã¢ãŠããçæ | ãã³ãã¬ãŒãããçæ |
ããŸããããªãã£ãããš(DMDX)
æå㯠DMDX(arXiv 2507.18569)ã® ADM ã data-space DMD ã«è¶³ãèšç»ã§ãããADM ã¯ãçæåšã®åºåã«ãã€ãºããããåã x_Ï ãããteacher(CFG ãã)ãš fake score ã® ODE ã Ît = 1/64 ã ãé²ãããã® 2 ã€ãèå¥åšã«èŠåããããæ¹åŒã§ãã
- çµæ: èå¥åšã¯ 130 åæŽæ°ããŠãæ£è§£ç 0.500ã0.506 ã®ãŸãŸã§ãåŠç¿ããŸããã§ãã(
logs/probe_adm_discriminator.jsonl)ã2 ã€ã®å ¥åã®å·®ã¯ Ît·(v_real â v_fake) ã ãã§ã1 æãã€ã®å€å®ã§ã¯ã»ãŒèŠåããããŸããã - æ¯èŒ: åããããã§æ¬ç©åŽã teacher ãµã³ãã«ã«ãããšã60 åã§ 0.56 â 0.68 ãŸã§äžãããŸãã(
logs/probe_teacher_discriminator.jsonl)ã - ãã®çµæãšããã®åŸã«åºã DMAD ãåããŠãfake score ã teacher ã®æšè«ããããªã DMAD ã«åãæ¿ããŸããã
ã©ã€ã»ã³ã¹ãšã¯ã¬ãžãã
- éã¿ãšã³ãŒã: Apache-2.0
- å ã®ã¢ãã«: OpenMOSS-Team/MOSS-Image-SFT(Apache-2.0)ãåæå€: lodestones/MOSS-Image-SFT-8-steps-dmd(Apache-2.0)
- åèã«ããè«æ:
- Few-Step Generation via Data-Space Iteration(arXiv 2610.12102)
- DMAD: Distribution Matching as Adversarial Distillation(arXiv 2610.02188ãã³ãŒã)
- Adversarial Distribution Matching / DMDX(arXiv 2507.18569)
- åäœ: Anima ã® DMDXã»DMD2ã»PCM èžçã®èšé²