Here are some of my problems, please advise

[CCCCCCCCCdut]

Hi, Dear author :
1. the paper is in q (Xt | X0) this part if you use the denominator instead not to calculate?
2. Why predict that x0 is a floating point number and not map it to one-hot?
3. step = t - 1 and step = t + 1 appear frequently in your code. Do they have a specific meaning? thank you