DDIM公式草稿2
q(xt−1∣xt,x0)上述推导并未使用q(xs∣xk,x0)T=1000T=1000=αt−1x0+1−αt−1 εε∼N(0,I)=αt−1αt1(xt−1−αt εθ(xt,t))+1−αt−1 ε=αt−1x0∣t^+1−αt−1 ε=αt−1x0∣t^+1−αt−1 εθ(xt,t)=αt−1x0∣t^+1−αt−1−σt2εθ+σtεq(xt∣xt−1)条件,即q(xt−1∣xt,x0)可以写做q(xs∣xk,x0)=αsx0∣k^+1−αs−σk2εθ+σkε999998...3210(DDPM)888666...1005010(DDIM)q(xt∣xt−1)=N(xt,αtxt−1,(1−αt)I)①trainphaseq(xt∣x0)=N(xt;αtxt,1−αtI)②samplingphasex0∣t^xt−1=αt1(xt−1−αtεθ(xt,t))=μ(xt,x0∣t^)+σtε
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