Real image-to-video, unlocking the i2v cluster. v2/recipes/wan21/i2v.py: CLIP image-encode -> the DiT's
encoder_hidden_states_image; first-frame VAE conditioning + a 4-channel mask -> the 20ch [mask|cond] that
the Wan adapter concatenates with the 16ch noise -> the 36ch i2v DiT input (mirrors fastvideo's
ImageEncodingStage + ImageVAEEncodingStage; v2's WanVAE.encode already applies the matching (z-mean)/std).
Reuses the shared WanDenoiseLoop (its None-default i2v hooks) + the Wan torch adapter unchanged. Adds
ToyImageEncoder + the image_encoder checkpoint subfolder stamp. Registered Wan2.1-Fun-1.3B-InP.
GPU-verified: loads via the generic Wan loader (1.56B, no param-mapping issue), runs the full i2v
conditioning, produces real video (3,9,256,384, std 0.44, finite, motion 0.041). CPU mini 211/2 (T2V
unregressed). BRINGUP: visual confirmation that the output follows the conditioning image is
human-in-the-loop.
Will Lin
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