Memcode SM2 formula

[lakesare]

@mustafa0x built a nice interface for playing with our SM2 algorithm: https://svelte.dev/repl/810665a44c904c17876fea2fc36fed8d?version=3.46.2

I wrote a quick test page for getNextScore, and seemed to be a good choice, but I did notice something. The difference between grade 5 and 4 seems to be very minor. Also, 1-3 seem to be fail grades, which seems to be a bit much.
(His comments).

As you see, 4 is barely different from 5. It's especially problematic that after grade 4 you'll be scheduled to review the flashcard in 44 days - it should be much sooner.
I notice I do use 4 as a very mild form of punishment when I'm reviewing the flashcards myself (meaning the user does get adjusted), however it would be better if we reviewed the flaschard again in, e.g., 1 day, then in 10 days, and then fully recovered our progress to the previous levels.

Grade 5	Grade 4

[lakesare]

Ideally we would manually specify the desired "scheduled to (days)", and then perform regression analysis, could be a good BSc thesis for someone (@kgashok, if someone's searching for a topic).

[kgashok]

@Pavithratrdev Please discuss with our faculty.

[Pavithratrdev]

Sure Sir

[mustafa0x]

Thanks for opening this up for discussion. For now I'm using a very simple exponential scheduler (number of times seen ^ n), but a more robust algorithm would be very nice indeed.