[R-package] Make saveRDS usable in R

[sebffischer]

Summary

Is it possible to make saveRDS usable with lightgbm models?

Motivation

It is quite annoying to not be able to use saveRDS

[jameslamb]

Thanks for using LightGBM!

Support for saving boosters with saveRDS() and loading them with readRDS() was added in #4685. That functionality has not made it into a release yet, so to use it you'll have to build the package from source.

git clone --recursive https://github.com/microsoft/LightGBM.git
cd LightGBM
sh build-cran-package.sh
R CMD INSTALL ./lightgbm_3.3.2.99.tar.gz

[sebffischer]

that is great to hear, thanks!

[github-actions]

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