| --- |
| license: other |
| base_model: FastVideo/FastVideo-FastH3-8-Step-V2 |
| tags: [video-generation, text-to-video, audio, fastvideo, bf16, pruned] |
| --- |
| # FastH3 Trim, 8-step, BF16 source weights |
|
|
| FastH3 Trim is an experimental, smaller version of [FastH3 V2](https://huggingface.co/FastVideo/FastVideo-FastH3-8-Step-V2): |
| eight-step text-to-video with synchronized audio from 42 of the 50 MiniMax H3 transformer blocks. We removed the eight |
| blocks whose removal changed video and audio predictions the least, replaced each block's AdaLN timestep projection with |
| a shared rank-16 basis, and trained the result with eight-step DMD2 (checkpoint 300). Removing blocks makes the model |
| faster and smaller but costs some quality; use FastH3 V2 when quality matters most. |
|
|
| - **Sampling:** 8 DMD steps (999, 874, 749, 624, 500, 375, 250, 125), sparse attention keeping 20% of tiles. |
| `fastvideo_inference.json` holds the schedule, which FastVideo reads automatically. |
| - **Text encoder:** NVFP4 Qwen3-VL trimmed to the 50 layers H3 reads. |
| - **VAE:** LynnReal lightweight video VAE with Kijai's INT8 weights; H3 audio VAE. |
|
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| Blog post: [FastH3 on Consumer Hardware](https://haoailab.com/blogs/fasth3-rtx/) · Code: [FastVideo](https://github.com/hao-ai-lab/FastVideo) |
|
|
| - **Transformer:** 34.9 GiB in BF16 (FP16 AdaLN factors). Source for the quantized releases and for local MLX conversion on Apple Silicon. |
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| Full-quality counterpart in the same format: [FastVideo/FastVideo-FastH3-8-Step-V2](https://huggingface.co/FastVideo/FastVideo-FastH3-8-Step-V2). |
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