This is very cool work! I have a quick follow-up: in the biomarker prediction task, what horizon (ie. how far into the future) did you set for the predictions? Prediction is hard beyond an hour, so it'd be impressive if your model handles that.

The prediction task is set up as predicting the next measured biomarkers based on a week of wearable data. So it's not necessarily predicting into the future, but predicting dataset Y given dataset X.

The specific biomarkers being predicted are the ones most relevant to heart health, like cholesterol or HbA1c. These tend to be more stable from hour to hour -- they may vary on a timescale of weeks as you modify your diet or take medications.

> of course, fold right is the more general operator, as you can implement fold left in terms of fold right.

The other way works too: fold right can be implemented in terms of fold left. Here's an approach using continuations in OCaml:

  let fold_right f z xs = (List.fold_left (fun kont x -> (fun y -> kont (f x y))) Fun.id xs) z;;