[Roadmap] 1.1.1 Patch Release

[hcho3]

We are looking to release a patch release 1.1.1, primarily to benefit from CPU performance improvement in the PyPI wheels (#5720). I'd like to know if there are other patches that should go into 1.1.1.

@dmlc/xgboost-committer

List of patches:

• CPU performance improvement in the PyPI wheels (Fix release degradation #5720)
• Fix loading old model. (Fix loading old model. #5724)
• Install pkg-config file (Add pkgconfig to cmake #5744)

[kongzii]

I am not sure that this counts as a patch, but if so, it would be awesome to have it in the release: #5744

[hcho3]

@kongzii The patch release will be released as compiled binaries. Wouldn't someone who want to use pkgconfig be compiling XGBoost from the source? Not sure what would be a benefit to backport #5744 to the patch release.

[kongzii]

@hcho3 I thought that if it would be in the patch release, then doing brew install xgboost would add pkg-config along with it, or do I need to do another update for it to work like that?
And there are also branches for releases, so git checkout release_1.1.1 would have pkg-config in it.

[hcho3]

@kongzii Ah I forgot about Homebrew. Yes, indeed, Homebrew will run make install and install the pkg-config. We'll add it to the release.

[kongzii]

Thank you 👍

[SmirnovEgorRu]

@hcho3, I suppose we can close the first task, performance of this was checked by @ShvetsKS

• CPU performance improvement in the PyPI wheels (Fix release degradation #5720)

[hcho3]

1.1.1 is now available from PyPI. To install, run python -m pip install xgboost==1.1.1.