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vae: mixed fp16 decoder + fp32 encoder/scales, single shard
Verified signatureReplaces the 3-shard fp32 video VAE with a single mixed-precision checkpoint: decoder weights in fp16, encoder + quant convs + the per-block scale1/scale2 residual anchors kept in fp32. Loads correctly with current diffusers (the class's _keep_in_fp32_modules upcasts the decoder, so behaviour is unchanged). Narrowing that list to ['encoder', 'quant_conv', 'post_quant_conv', 'scale1', 'scale2'] gives 5.19 GiB of weights and 6.06 GiB of decode peak instead of 9.70 / 14.63, at 77.2 dB vs 77.3 dB against a true-fp32 decode (81.1 dB against the previous checkpoint, max deviation 0.78/255). Download shrinks from 9.8 GB to 5.2 GB. See the README.ee0070d
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