Changelog instructions

This directory (doc/whats_new/upcoming_changes) contains "news fragments", which are short files that contain a small ReST-formatted text that will be added to the next release changelog.

Each file should be named like <PULL REQUEST>.<TYPE>.rst, where <PULL REQUEST> is a pull request number, and <TYPE> is one of:

major-feature
feature
efficiency
enhancement
fix
api
other (see )

See this for more details about the meaning of each type.

This file needs to be added to the right folder like sklearn.linear_model or sklearn.tree depending on which part of scikit-learn your PR changes. There are also a few folders for some topics like array-api, metadata-routing or security.

In almost all cases, your fragment should be formatted as a bullet point.

For example, 28268.feature.rst would be added to the sklearn.ensemble folder with the following content::

- :class:`ensemble.ExtraTreesClassifier` and :class:`ensemble.ExtraTreesRegressor`
  now supports missing values in the data matrix `X`. Missing-values are
  handled by randomly moving all of the samples to the left, or right child
  node as the tree is traversed.
  By :user:`Adam Li <adam2392>`

If you are unsure how to name the news fragment or which folder to use, don't hesitate to ask in your pull request!

You can install towncrier and run towncrier create to help you create a news fragment. You can also run towncrier build --draft --version <version_number> if you want to get a preview of how your change will look in the final release notes.

`custom-top-level` folder

The custom-top-level folder is for changes for which there is no good folder and are somewhat one-off topics. Type other is mostly meant to be used in the custom-top-level section.

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