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关于combine函数
请教一下，在diffusion的notebook中，定义了一个combine的类。
我个人理解其本质是将image与time step信息给合并到一起。
源代码中由b个随机数，将这个随机数列作为schedule的输入，得到noise_r和image_r。
这2个系数用于image的加噪过程。
而noise_r又作为combine函数的输入。然后combine的输出放到unet中去预测噪声。
我的问题是，combine过程中的种种复杂数学变换，有什么理论基础么？烦请给点提示。
谢谢！
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