Describe the bug

After upgrading from 0.12.1 to 0.13.0, the training slows down 2~3x.

For details:

• [BUG] Training is 2.5x slower in burn-0.13.0 than burn-0.12.1 open-spaced-repetition/fsrs-rs#185

To Reproduce

1. git clone https://github.com/open-spaced-repetition/fsrs-rs
2. run this test: cargo test --release -- training::tests::training --nocapture
3. git checkout burn-0.12.1
4. run the test again

Expected behavior

The tests should be finished in the same time.

Screenshots

Desktop (please complete the following information):

• OS: Mac 13.3.1 (22E261)

Additional context

FSRS is a time-series model.

The test files in /tests/data:

collection.anki21.zip

revlog.csv

FrameGraph:

0.12.1:

0.13.0: