There are some questions about forecasting.

[ws1234321]

Hi,I use data from 1 to 20, and the training and evaluation steps are both 4. Left aligned, the predicted data are 3, 4, 5, and 6. Right aligned, the predicted results are 17, 18, 19, and 20. If I want to predict 21, 22, 23, and 24, what should I do? Does the target dataset have to have? When I set the target data set to nan, I predicted nan.Thank you in advance.