[Question] - Githubissues

open-spaced-repetition / fsrs4anki

A modern Anki custom scheduling based on Free Spaced Repetition Scheduler algorithm

https://github.com/open-spaced-repetition/fsrs4anki/wiki

MIT License

2.76k stars 137 forks source link

[Question] #666

Closed sineptic closed 4 months ago

sineptic commented 4 months ago

Research

[x] I have checked the FAQ and could not find an answer to my question
[x] I have read the wiki and still felt confused
[x] I have searched for similar existing questions here

Question I don't use anki. Why it need retrievability to calculate new stability (in 4 version)? and why it needed second time to calculate next_review if it already used?

L-M-Sherlock commented 4 months ago

The user may not review the card in the scheduled date.

sineptic commented 4 months ago

but new stability calculated when user complete card. algorithm use predicted R at this moment?

L-M-Sherlock commented 4 months ago

Yes. FSRS is based on DSR model. You can read this for details: https://supermemo.guru/wiki/SuperMemo_Algorithm:_30-year-long_labor#Increase_in_memory_stability_with_rehearsal