Update README.md

README.md

@@ -29,7 +29,7 @@ Note: as indicated in the formulae, C(x, t) is constant. The intent is to make t
 x_t and snr_t were taken from the DDPM paper (https://arxiv.org/abs/2006.11239):
 
 $$
-x_t = \sqrt{\bar{\alpha}_t} x + \sqrt{1 - \bar{\alpha}_t} \epsilon \\
+x_t = \sqrt{\bar{\alpha}_t} x_0 + \sqrt{1 - \bar{\alpha}_t} \epsilon \\
 snr_t = \frac{\sqrt{\bar{\alpha}_t}}{\sqrt{1 - \bar{\alpha}_t}}
 $$