My experience of 13 months of using the Anki spaced repetition memory system (me, in email). Makes memorization a choice, not a happenstancepic.twitter.com/Qwh25Rz4ux
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Duolingo has published some interesting stuff on using ML to estimate spacing. There are some obvious improvements, still...
What I would look at is automatically detecting confusing pairs and really concentrating on them.
AFAICT if a card is confusing, either (a) I should add another card; or (b) I should rewrite the card. Seems to work well...
I worked on reversing ML behind this while back:) They offer positive feedback learning, associated dopamine often
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