For the first update in 2024, the Ensmallen Development Team has issued a fix for numerical precision issues in the small-gradient L-BFGS scaling factor computations.
Additional details are covered in the news entry for the package update below:
RcppEnsmallen
news file entry for version v0.2.21.1.1 (2024-02-17)
- Upgraded to ensmallen 2.21.1: “Bent Antenna” (2024-02-16)