Even when the stability increased, the last interval still went backwards from 4 days to 3 days:
After 4 days elapsed, the hard interval was still 2 days, and the good interval was 3 days, which was less than 4 days, so it didn't trigger the function to avoid fuzz to go backwards.
[src/inference.rs:832:9] &next_states = NextStates {
again: ItemState {
memory: MemoryState {
stability: 0.5836956,
difficulty: 9.986542,
},
interval: 0.5836956,
},
hard: ItemState {
memory: MemoryState {
stability: 1.8026618,
difficulty: 9.977774,
},
interval: 1.8026618,
},
good: ItemState {
memory: MemoryState {
stability: 1.9455183,
difficulty: 9.969007,
},
interval: 1.9455183,
},
easy: ItemState {
memory: MemoryState {
stability: 3.0436015,
difficulty: 9.960239,
},
interval: 3.0436015,
},
}
[src/inference.rs:835:9] hard_interval = 2
[src/inference.rs:835:9] good_interval = 3
[src/inference.rs:837:9] fuzzed_good_interval = 4
[src/inference.rs:840:9] &next_states = NextStates {
again: ItemState {
memory: MemoryState {
stability: 0.75977373,
difficulty: 9.985005,
},
interval: 0.75977373,
},
hard: ItemState {
memory: MemoryState {
stability: 2.4843144,
difficulty: 9.974718,
},
interval: 2.4843142,
},
good: ItemState {
memory: MemoryState {
stability: 2.7269485,
difficulty: 9.96443,
},
interval: 2.7269483,
},
easy: ItemState {
memory: MemoryState {
stability: 4.591988,
difficulty: 9.954142,
},
interval: 4.591988,
},
}
[src/inference.rs:843:9] hard_interval = 2
[src/inference.rs:843:9] good_interval = 3
Even when the stability increased, the last interval still went backwards from 4 days to 3 days:
After running several tests, I figured it out. Anki forces good_interval >= hard_interval+1 and the second last hard interval was 2 days, so the good interval was 3 days. Due to fuzz, a 3 day interval can be 2, 3 or 4 days. In this case, it was 4 days.
After 4 days elapsed, the hard interval was still 2 days, and the good interval was 3 days, which was less than 4 days, so it didn't trigger the function to avoid fuzz to go backwards.
@user1823 please take a look.