v0.38.0

New Pipelines

LLaDA2

LLaDA2 is a family of discrete diffusion language models that generate text through block-wise iterative refinement. Instead of autoregressive token-by-token generation, LLaDA2 starts with a fully masked sequence and progressively unmasks tokens by confidence over multiple refinement steps.

• PR: https://github.com/huggingface/diffusers/pull/13226
• Docs: https://huggingface.co/docs/diffusers/main/api/pipelines/llada2

Nucleus-MoE

NucleusMoE-Image is a 2B active 17B parameter model trained with efficiency at its core. Our novel architecture highlights the scalability of a sparse MoE architecture for Image generation.

• PR: https://github.com/huggingface/diffusers/pull/13317
• Docs: https://huggingface.co/docs/diffusers/main/api/pipelines/nucleusmoe_image

Thanks to @sippycoder for the contribution.

Ernie-Image

ERNIE-Image is a powerful and highly efficient image generation model with 8B parameters.

• PR: https://github.com/huggingface/diffusers/pull/13432
• Docs: https://huggingface.co/docs/diffusers/main/api/pipelines/ernie_image

Thanks to @HsiaWinter for the contribution.

LongCat-AudioDiT

LongCat-AudioDiT is a text-to-audio diffusion model from Meituan LongCat.

• PR: https://github.com/huggingface/diffusers/pull/13483
• Docs: https://huggingface.co/docs/diffusers/main/api/pipelines/longcat_audio_dit

Thanks to @RuixiangMa for the contribution.

Ace-Step 1.5

ACE-Step 1.5 generates variable-length stereo audio at 48 kHz (10 seconds to 10 minutes) from text prompts and optional lyrics. The full system pairs a Language Model planner with a Diffusion Transformer (DiT) synthesizer; this pipeline wraps the DiT half of that stack, and consists of three components: an AutoencoderOobleck VAE that compresses waveforms into 25 Hz stereo latents, a Qwen3-based text encoder for prompt and lyric conditioning, and an AceStepTransformer1DModel DiT that operates in the VAE latent space using flow matching.

• PR: https://github.com/huggingface/diffusers/pull/13095
• Docs: https://huggingface.co/docs/diffusers/main/api/pipelines/ace_step

Thanks to @ChuxiJ for the contribution.

Flux.2 Small Decoder

Make your Flux.2 decoding faster with this new small decoder model from the Black Forest Labs. You can check it out here. It was contributed by @huemin-art in this PR.

Modular Pipeline Support

We added modular support for LTX-2 and Hunyuan 1.5.

Core Library

• Flash Attention 4 backend
• FlashPack loading
• Group offloading + TorchAO
• ring_anything as a new CP backend
• Profiling pipelines in Diffusers

All commits

• [Discrete Diffusion] Add LLaDA2 pipeline by @kashif in #13226
• [LLADA2] documentation fixes by @kashif in #13333
• [ci] claude in ci. by @sayakpaul in #13297
• [docs] kernels by @stevhliu in #13139
• [tests] Tests for conditional pipeline blocks by @sayakpaul in #13247
• avoid hardcode device in flux-control example by @kaixuanliu in #13336
• fix claude workflow to include id-token with write. by @sayakpaul in #13338
• Update LTX-2 Docs to Cover LTX-2.3 Models by @dg845 in #13337
• remove str option for quantization config in torchao by @howardzhang-cv in #13291
• [ci] include checkout step in claude review workflow by @sayakpaul in #13352
• change minimum version guard for torchao to 0.15.0 by @howardzhang-cv in #13355
• [ci] move to assert instead of self.Assert* by @sayakpaul in #13366
• [docs] refactor model skill by @stevhliu in #13334
• Fix Ulysses SP backward with SDPA by @zhtmike in #13328
• Add train flux2 series lora config by @tcaimm in #13011
• [docs] Add NeMo Automodel training guide by @pthombre in #13306
• Fix: ensure consistent dtype and eval mode in pipeline save/load tests by @YangKai0616 in #13339
• [ci] support claude reviewing on forks. by @sayakpaul in #13365
• Fix MotionConv2d to cast blur_kernel to input dtype instead of reverse by @YangKai0616 in #13364
• chore: update claude_review.yml by @hf-security-analysis[bot] in #13374
• corrects single file path validation logic by @andrew-w-ross in #13363
• [docs] deprecate pipelines by @stevhliu in #13157
• 🔒 Pin GitHub Actions to commit SHAs by @paulinebm in #13385
• [docs] add auto docstring and parameter templates documentation for m… by @yiyixuxu in #13382
• Fix typos and grammar errors in documentation by @GalacticAvenger in #13391
• fix(ddim): validate eta is in [0, 1] in DDIMPipeline by @NIK-TIGER-BILL in #13367
• Fix Dynamo lru_cache warnings during torch.compile by @jiqing-feng in #13384
• [tests] refactor wan autoencoder tests by @sayakpaul in #13371
• NucleusMoE-Image by @sippycoder in #13317
• Add examples on how to profile a pipeline by @sayakpaul in #13356
• Update README.md of the profiling guide by @sayakpaul in #13400
• [CI] Refactor Cosmos Transformer Tests by @DN6 in #13335
• [tests] refactor autoencoderdc tests by @sayakpaul in #13369
• [CI] Hunyuan Transformer Tests Refactor by @DN6 in #13342
• Fix VAE offload encode device mismatch in DreamBooth scripts by @azolotenkov in #13417
• Remove references to torchao's AffineQuantizedTensor by @andrewor14 in #13405
• [tests] fix autoencoderdc tests by @sayakpaul in #13424
• [core] fix group offloading when using torchao by @sayakpaul in #13276
• Fix IndexError in HunyuanVideo I2V pipeline by @kaixuanliu in #13244
• improve Claude CI by @yiyixuxu in #13397
• FLUX.2 small decoder by @huemin-art in #13428
• [CI] Add PR/Issue Auto Labeler by @DN6 in #13380
• [CI] Add GLM Image Transformer Model Tests by @DN6 in #13344
• [CI] Use finegrained token for Issue Labeler by @DN6 in #13433
• Handle prompt embedding concat in Qwen dreambooth example by @chenyangzhu1 in #13387
• fix(qwen-image dreambooth): correct prompt embed repeats when using --with_prior_preservation by @chenyangzhu1 in #13396
• Cache RoPE freqs on device to avoid repeated CPU-GPU copy in QwenImage by @akshan-main in #13406
• [tests] tighten dependency testing. by @sayakpaul in #13332
• Fix grammar in LoRA documentation by @Xyc2016 in #13423
• Fix HunyuanVideo 1.5 I2V by preprocessing image at pixel resolution i… by @akshan-main in #13440
• [modular] Add LTX Video modular pipeline by @akshan-main in #13378
• Add ernie image by @HsiaWinter in #13432
• [core] fix fa4 integration by @sayakpaul in #13443
• FlashPack by @hlky in #12700
• [ptxla] fix pytorch xla inference on TPUs. by @entrpn in #13463
• fix some dtype issue for gguf / some gpu backends by @HsiaWinter in #13464
• Fix Qwen Image DreamBooth prior-preservation batch ordering by @azolotenkov in #13441
• [tests] fix deprecated attention processor testing. by @sayakpaul in #13469
• [tests] xfail clip related issues. by @sayakpaul in #13454
• [agent] add modular doc by @yiyixuxu in #13410
• [tests] fix training tests by @sayakpaul in #13442
• fix(profiling): preserve instance isolation when decorating methods by @Akash504-ai in #13471
• [Feat] Adds LongCat-AudioDiT pipeline by @RuixiangMa in #13390
• Fix Flux2 DreamBooth prior preservation prompt repeats by @azolotenkov in #13415
• chore: bump doc-builder SHA for PR upload workflow by @rtrompier in #13476
• Remove compile bottlenecks from ZImage pipeline by @hitchhiker3010 in #13461
• [chore] Add diffusers-format example to LongCatAudioDiTPipeline by @RuixiangMa in #13483
• [core] fix autoencoderkl qwenimage for xla by @sayakpaul in #13480
• add PR fork workable by @paulinebm in #13438
• Add modular pipeline for HunyuanVideo 1.5 by @akshan-main in #13389
• [agents docs] add float64 gotcha by @yiyixuxu in #13472
• fix(ernie-image): avoid locals() comprehension scope issue in callback kwargs by @songh11 in #13478
• [Bugfix] Fix shape mismatch in LongCatAudioDiTTransformer conversion by @RuixiangMa in #13494
• feat: bump safetensors to 0.8.0-rc.0 by @McPatate in #13470
• fix(qwen): fix CFG failing when passing neg prompt embeds with none mask by @Sunhill666 in #13379
• add an example of spmd for flux on v5e-8 by @sayakpaul in #13474
• Add FLUX.2 Klein Inpaint Pipeline by @adi776borate in #13050
• [docs] add a mention of torchao and other backends in speed memory docs. by @sayakpaul in #13499
• Fix Flux2 non-diffusers guidance LoRA conversion by @yadferhad in #13486
• add _native_npu_attention support mask shape like [B,1,1,S] by @chang-zhijie in #13490
• fix(freeu): run FFT in float32 for float16 inputs to avoid ComplexHalf by @Ricardo-M-L in #13503
• Fix non-deterministic T5 outputs in HiDream pipeline tests by @kaixuanliu in #13534
• Fix AuraFlow attn processors applying norm_added_q to key projection by @Ricardo-M-L in #13533
• add _repeated_blocks for ErnieImageTransformer2DModel by @kaixuanliu in #13496
• [CI] Fix BnB tests by @DN6 in #13481
• [tests] fix group offloading with disk tests by @sayakpaul in #13491
• [ci] feat: have pr labeler label for closing issues. by @sayakpaul in #13548
• Improve trust_remote_code by @hlky in #13448
• chore: bump doc-builder SHA for main doc build workflow by @rtrompier in #13555
• [ci] simplify release workflow. by @sayakpaul in #13329
• [attention backends] fix ring CP for flash and flash 3 by @sayakpaul in #13182
• [agents docs] add pipelines.md etc by @yiyixuxu in #13567
• Add Ernie-Image modular pipeline by @akshan-main in #13498
• [agents docs] update modular.md by @yiyixuxu in #13568
• [docs] fix typo in AutoencoderOobleck docs by @ivnvalex in #13642)
• Fix ErnieImagePipeline pre-computed prompt_embeds + num_images_per_prompt shape mismatch by @Ricardo-M-L in #13532
• feat: support ring attention with arbitrary KV sequence lengths by @songh11 in #13545
• [ci] use tokenizers stable installtion in CI. by @sayakpaul in #13562
• NucleusMoE docs by @sayakpaul in #13661
• Fix UniPC scheduler device mismatch when using offloading by @ParamChordiya in #13489
• [Ernie-Image] Add lora support by @asomoza in #13575
• Add ACE-Step pipeline for text-to-music generation by @ChuxiJ in #13095
• Fix missing latents_bn_std dtype cast in VAE normalization by @adi776borate in #13299
• Release: v0.38.0-release by @sayakpaul (direct commit on v0.38.0-release)

Significant community contributions

The following contributors have made significant changes to the library over the last release:

• @kashif
  • [Discrete Diffusion] Add LLaDA2 pipeline (#13226)
  • [LLADA2] documentation fixes (#13333)
• @howardzhang-cv
  • remove str option for quantization config in torchao (#13291)
  • change minimum version guard for torchao to 0.15.0 (#13355)
• @sippycoder
  • NucleusMoE-Image (#13317)
• @DN6
  • [CI] Refactor Cosmos Transformer Tests (#13335)
  • [CI] Hunyuan Transformer Tests Refactor (#13342)
  • [CI] Add PR/Issue Auto Labeler (#13380)
  • [CI] Add GLM Image Transformer Model Tests (#13344)
  • [CI] Use finegrained token for Issue Labeler (#13433)
  • [CI] Fix BnB tests (#13481)
• @akshan-main
  • Cache RoPE freqs on device to avoid repeated CPU-GPU copy in QwenImage (#13406)
  • Fix HunyuanVideo 1.5 I2V by preprocessing image at pixel resolution i… (#13440)
  • [modular] Add LTX Video modular pipeline (#13378)
  • Add modular pipeline for HunyuanVideo 1.5 (#13389)
  • Add Ernie-Image modular pipeline (#13498)
• @HsiaWinter
  • Add ernie image (#13432)
  • fix some dtype issue for gguf / some gpu backends (#13464)
• @hlky
  • FlashPack (#12700)
  • Improve trust_remote_code (#13448)
• @RuixiangMa
  • [Feat] Adds LongCat-AudioDiT pipeline (#13390)
  • [chore] Add diffusers-format example to LongCatAudioDiTPipeline (#13483)
  • [Bugfix] Fix shape mismatch in LongCatAudioDiTTransformer conversion (#13494)
• @adi776borate
  • Add FLUX.2 Klein Inpaint Pipeline (#13050)
  • Fix missing latents_bn_std dtype cast in VAE normalization (#13299)
• @ChuxiJ
  • Add ACE-Step pipeline for text-to-music generation (#13095)