[Question] Simulator - What is recall_repetitions, forget_repetitions, new_repetitions, and period_len

[kuroahna]

I'm testing the simulator and this is really cool, but I'm not 100% sure what recall_repetitions, forget_repetitions, new_repetitions, and period_len are

1. Is recall_repetitions how many repetitions it takes to pass a "review" card? For example, in Anki, when I review an existing card, and I press good, that means it is 1 repetition. Not sure what happens when you press Again (fail card). I suppose this is counted for in forget_repetitions
2. Is forget_repetitions how many repetitions it takes to review a card? For example, in Anki, in the options, there is "Lapses" section and I have the steps configured as "2 60", so would forget_repetitions be 2 here?
3. Is new_repetitions how many repetitions it takes to learn a "new" card? For example, in Anki, in the options, there is the "New cards" section, and I have the steps configured as "1 5 60", so would new_repetitions be 3 here?
4. Not sure what period_len is. In the graphs, I see "review cards per day (14 days average)" and "repetitions per day (14 days average)" since period_len=14 by default. Does this mean that you are adding a data point for every 14 days? So if I want to see the "review cards per day" and "repetitions per day" for every day, then I would set this to 1?

[L-M-Sherlock]

1. Yes, if you press hard, good and easy when you review, Anki will pass the card. So you only have 1 repetition for a card.
2. You can refer to the Anki simulator add-on https://ankiweb.net/shared/info/817108664
3. Same to above
4. It’s used to smooth the curve. You can see this wiki page https://en.m.wikipedia.org/wiki/Moving_average

[kuroahna]

Thanks. I had a look at Anki simulator addon

2. I assume forget_repetitions is the number of "Lapse steps" seen above
3. And same for new_repetitions. This is the number of "Learning steps"

[L-M-Sherlock]

Not very accurate. If you lapse steps is "2 60", you could press the 'again' button consistently. And press 'easy' could pass these steps.

[kuroahna]

Right, that makes sense.

Sorry, but I feel very dumb, I still don't really understand or know what forget_repetitions and new_repetitions is. I looked at Anki Simulator addon that you linked, but they don't mention anything about forget_repetitions or new_repetitions. I thought it was the number of lapse steps and number of learning steps, but from your response above, I don't think that's the case.

I also looked at their source code and all I can find is

        number_of_learning_steps: int,
        number_of_lapse_steps: int,

I don't see anything related to forget_repetitions or new_repetitions like you have mentioned. Should I leave things as default then?

recall_repetitions = 1
forget_repetitions = 2
new_repetitions = 1

I wanted a rough estimation of how many reviews I would get using fsrs4anki using your simulator if I had lapse steps 2 60 and learning steps 1 5 60 in Anki, which is why I set them to

recall_repetitions = 1
forget_repetitions = 2
new_repetitions = 3

but I'm still not sure if this is what I should do

[L-M-Sherlock]

The accurate repetitions are only from your actual review logs. I will implement it in the simulator in the future.

But you can use the number of steps as a rough estimation.