What regressor should I use? Lagged or Future?

[kkckk1110]

Hello, I found neural prophet quite useful in my task and would like to thank the authors. However, I have a question about the selection of lagged and future regressors. In my task, when I forecast y at time t, it is expected that the regressors at time t, t-1, t-2..., t-p, are included. But the future information of the regressor is unknown. I read the tutorial and noticed that, if I treat it as a lagged regressor, I can only access to its value up to t-1. So I am confused that, what regressor should I use in this case? I am looking forward to your reply. Thanks a lot.