---
license: apache-2.0
base_model:
  - ByteDance/Bernini-Diffusers
tags:
  - wan2.2
  - bernini
  - fp8
  - comfyui
  - text-to-video
---

# Bernini (full) Wan2.2 renderer — fp8 e4m3 *scaled* (ComfyUI)

The two DiT renderer transformers of the **full** [ByteDance Bernini](https://github.com/bytedance/Bernini)
pipeline (`diff_dec` = high-noise expert, `diff_dec_low` = low-noise expert),
quantized to **fp8 `e4m3` scaled** in the ComfyUI format.

The layout is **byte-for-byte structurally identical** to
[`Comfy-Org/Bernini-R`](https://huggingface.co/Comfy-Org/Bernini-R)'s
`wan2.2_bernini_r_*_fp8_scaled.safetensors` (verified: same 1815 keys, shapes,
dtypes, and `__metadata__`) — the difference is only the weights, which here are
the **full Bernini** renderer (jointly trained with the MLLM planner) rather than
the renderer-only Bernini-R.

## Files

| File | model_type | size |
|------|------------|------|
| `wan2.2_bernini_high_noise_fp8_scaled.safetensors` | `bernini_high` | ~15.5 GB |
| `wan2.2_bernini_low_noise_fp8_scaled.safetensors`  | `bernini_low`  | ~15.5 GB |

Drop them into `ComfyUI/models/diffusion_models/` and use them anywhere the
Bernini-R fp8_scaled files work (same `model_type`, same keys).

## Quantization details

- Format marker per quantized weight: `comfy_quant = {"format": "float8_e4m3fn"}`.
- Quantized Linears: `self_attn.{q,k,v,o}`, `cross_attn.{q,k,v}` (cross-attn `o`
  kept in fp16), `ffn.0`, `ffn.2` — 9 per block × 40 = 360 weights per expert.
- For each quantized weight `W`: `scale = max(|W|)/448`,
  `W_fp8 = (W/scale).clamp(±448).to(float8_e4m3fn)`, stored alongside a scalar
  `weight_scale` (fp32). Dequant: `W ≈ W_fp8.to(dtype) * weight_scale`.
- Everything else (norms, `modulation`, `patch_embedding`, `text/time_embedding`,
  `time_projection`, `head`, all biases) is kept in **fp16**.
- Mean per-tensor reconstruction error ≈ **2.2%**.
- Source: extracted from [`ByteDance/Bernini-Diffusers`](https://huggingface.co/ByteDance/Bernini-Diffusers)
  (`bernini/` checkpoint, fp32), with diffusers `WanTransformer3DModel` keys
  remapped to the original Wan / ComfyUI naming.

License: Apache-2.0, inherited from the upstream Bernini release.