Pytorch-forecasting: Applying prediction plotting on in-sample data

I am very new to Pytorch and Pytorch-forecasting and I was wondering how I can access the predictions made in-sample (on the training set) for plotting purposes? More concretely, I am following this tutorial for time-series forecasting, and I can see the code that makes the predictions on out-sample (validation) data but can’t find the in sample predictions.

I guess you should be able to call best_tft.predict on the training data.