Adding FSRS retrievability to AnkiConnect

kiru · March 19, 2024, 11:03am

I would like to modiffy AnkiConnect plugin to include the FSRS retrievability score ( via [0])
Does anyone know where the FSRS retrievability score is calculated?

I know where to change it in the plugin [1], but I don’t know where in Anki-source code it is exactly calculated. All the places I could find were in Rust.
There is an SQL function to calculate it [2], but I am kinda lost on what parameter to pass in [1].

[0] anki-connect#getreviewsofcards
[1] anki-connect/src/branch/master/plugin/init.py#L1582
[2] sqlite.rs#L270

(edit: I would love to add links, but I can’t since this account is new)

L.M.Sherlock · March 19, 2024, 5:34pm

It’s calculated in the Rust backend:

github.com

ankitects/anki/blob/f413274fba452752b0bcc80ced085a1fff62cf8e/rslib/src/browser_table.rs#L510-L522


      
          fn fsrs_retrievability_str(&self) -> String {
              self.cards[0]
                  .memory_state
                  .as_ref()
                  .zip(self.cards[0].days_since_last_review(&self.timing))
                  .map(|(state, days_elapsed)| {
                      let r = FSRS::new(None)
                          .unwrap()
                          .current_retrievability((*state).into(), days_elapsed);
                      format!("{:.0}%", r * 100.)
                  })
                  .unwrap_or_default()
          }

kiru · March 20, 2024, 6:02pm

Thank you, that helps; but not sure at this point how to call that function from the Python part.

abdo · March 20, 2024, 8:20pm

On the Python side, you only have access to card.memory_state. Apparently you need to re-implement current_retrievability() and days_since_last_review().

L.M.Sherlock · March 21, 2024, 2:36am

In the old version of FSRS4Anki Helper add-on, I developed a function to calculate the current retrievability:

github.com

open-spaced-repetition/fsrs4anki-helper/blob/3eb7498d1d23abe02a345e546ae31ac0bbe45c08/browser/custom_columns.py#L107-L129


      
          def _display_value(self, card: Card) -> str:
              custom_scheduler = check_fsrs4anki(mw.col.all_config())
              version = get_version(custom_scheduler)
              if card.type != 2:
                  return "N/A"
              if card.custom_data == "":
                  return "N/A"
              custom_data = json.loads(card.custom_data)
              if "s" not in custom_data:
                  return "N/A"
              today = mw.col.sched.today
              try:
                  revlog = filter_revlogs(mw.col.card_stats_data(card.id).revlog)[0]
              except IndexError:
                  return "N/A"
              last_review = get_last_review_date(revlog)
              elapsed_days = today - last_review
              retrievability = (
                  exponential_forgetting_curve(elapsed_days, custom_data["s"])
                  if version[0] == 3

This file has been truncated. show original

I hope it would be helpful.

system · April 20, 2024, 2:37am

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Adding FSRS retrievability to AnkiConnect

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