
Denoising score matching learns to denoise by estimating the score (gradient of log probability) of data distributions
Image: Ptrump16, Public domain, via Wikimedia Commons
Denoising score matching learns to denoise by estimating the score (gradient of log probability) of data distributions
score matching does: learns the gradient of the log-density without normalizing
Matching score learns gradient of log-density without normalizing
the reverse process learns: p_θ(x_{t-1}|x_t)
The reverse process learns: p_θ(x_{t-1}|x_t) — denoising one step at a time
Langevin dynamics does: adds noise to gradient descent to sample from a distribution
Langevin dynamics adds noise to gradient descent to sample from a distribution
Brier score
Brier score measures mean squared error of probability predictions
AdaGrad's learning rate decays to zero
AdaGrad adjusts learning rate by accumulating squared gradients, causing it to decay to zero as denominator grows exponentially
classifier-free guidance does: interpolates between conditional and unconditional generation
"Classifies samples as either conditioned or unconditioned, guiding generation towards desired outcomes."
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