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告别 VAE 伪影!北京大学提出 PixelGen:引入感知流形,让像素级扩散 ...
像素扩散模型虽然避开了 VAE,但它要面对的是一个极其复杂的高维空间。在这个空间里,除了我们关心的物体形状、颜色,还充斥着大量的“无效信息”,比如相机的噪声、肉眼不可见的细节。让模型去逐个像素地死磕这些无效信号,不仅浪费算力,还会让训练变得异常困难。
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