Diffusion Model
Forward Process
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Formulas
αt = 1 - βt (signal remaining at step t) ᾱt = α₁ × α₂ × ... × αt (product of all α) q(xt|x₀) = N(√ᾱt × x₀, (1-ᾱt) × I)
Key Distinction
αt = one step only. ᾱt = ALL steps multiplied together. Don't confuse them.