WAN 2.2 14B I2V Hybrid Precision
- FP32 Layers: All Attention mechanisms, Time/Condition Embeddings, LayerNorms, and the First/Last Transformer blocks remain in exact FP32. (preserves prompt adherence, color stability, and fluid motion)
- BF16 Layers: The FFN/MLP are cast to BFloat16. (robust to BF16)
_Left: This model without LightX2V | Middle: This model with LightX2V | Right: BF16 | Fixed seed, Same LightX2V and prompt_
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Source: Wan2.2-I2V-A14B-FP32-ComfyUI.
LightX2V 4-Step LoRAs (BF16)
_Something is off with these LoRAs. I redownloaded the full FP32 models by Lightx2v, and the issues are still there: broken animations, body deformities, missing fingers or extra hands. Out of 10 videos, 2 are affected,so if you see it, you’ll know what it is._
Sampler: Euler with a Normal or Simple scheduler. (distill loras)
LightX2V 4-stepLoRAs, converted to BF16 (preventing accidental downcasting the base to FP16)