Patch for #462 (#469)

Co-authored-by: Jarrett Ye <[email protected]>

config.json

@@ -8,12 +8,12 @@
  "auto_disperse_when_review": false,
  "auto_disperse_after_reschedule": false,
  "mature_ivl": 21,
- "reschedule_threshold": 0.25,
+ "reschedule_threshold": 0,
  "debug_notify": false,
  "fsrs_stats": true,
  "display_memory_state": false,
  "auto_easy_days": false,
  "has_rated": false,
  "has_sponsored": false,
  "skip_manual_resched_cards": false
-}
+}

schedule/reschedule.py

@@ -160,7 +160,7 @@ def apply_fuzz(self, ivl):
  )
  return best_ivl
 
- def next_interval(self, stability):
+ def fuzzed_next_interval(self, stability):
  new_interval = next_interval(stability, self.desired_retention)
  return self.apply_fuzz(new_interval)
 
@@ -366,21 +366,24 @@ def reschedule_card(cid, fsrs: FSRS, recompute=False):
  if card.type == CARD_TYPE_REV:
  fsrs.set_card(card)
  fsrs.set_fuzz_factor(cid, card.reps)
- new_ivl = fsrs.next_interval(s)
+ new_ivl = fsrs.fuzzed_next_interval(s)
 
- dr = fsrs.desired_retention
- odds = dr / (1 - dr)
+ if fsrs.reschedule_threshold > 0 and not fsrs.apply_easy_days:
+ dr = fsrs.desired_retention
+ odds = dr / (1 - dr)
 
- reduced_odds = (1 - fsrs.reschedule_threshold) * odds
- fsrs.desired_retention = reduced_odds / (reduced_odds + 1)
- adjusted_ivl_upper = fsrs.next_interval(s)
+  odds_lower = (1 - fsrs.reschedule_threshold) * odds
+  fsrs.desired_retention = odds_lower / (odds_lower + 1)
+  adjusted_ivl_upper = next_interval(s)
 
- increased_odds = (1 + fsrs.reschedule_threshold) * odds
- fsrs.desired_retention = increased_odds / (increased_odds + 1)
- adjusted_ivl_lower = fsrs.next_interval(s)
+  odds_upper = (1 + fsrs.reschedule_threshold) * odds
+  fsrs.desired_retention = odds_upper / (odds_upper + 1)
+  adjusted_ivl_lower = next_interval(s)
 
- if card.ivl >= adjusted_ivl_lower and card.ivl <= adjusted_ivl_upper:
- return None
+ fsrs.desired_retention = dr
+
+ if card.ivl >= adjusted_ivl_lower and card.ivl <= adjusted_ivl_upper:
+ return None
 
  due_before = card.odue if card.odid else card.due
  card = update_card_due_ivl(card, new_ivl)