Kijai/WanVideo_comfy_nvfp4

Original repo:

https://huggingface.co/lightx2v/Wan2.2-NVFP4-Sparse

LightX2V's NVFP4 → Comfy NVFP4, same datatype, different conventions:

• Nibble swap on U8 weights — Comfy's store_fp4x2 reverses NVIDIA-spec packing
• weight_scale correct as it is
• weight_scale_2 = alpha × input_global_scale — LightX2V stores a CUTLASS post-matmul rescaler, Comfy uses the divisive per-tensor scale
• input_scale = 1 / input_global_scale — same convention flip