Update README.md

README.md

@@ -25,7 +25,7 @@ $$
 
 Note: as indicated in the formulae, C(x, t) is constant. The intent is to make the contribution to the accumulated absolute gradients (see below) constant for all timesteps. As C(x, t) = L_0(x, t), this means L = 1. However, expressing L in this way overlooks the way the gradients are computed. I think the formulation with the expected value is less ambiguous.
 
-from the DDPM paper (https://arxiv.org/abs/2006.11239):
+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 \\