[python-package] prefix cast_numpy_array_to_dtype with _

[Madnex]

Contributes to #5313

[jameslamb]

@Madnex , I think you might want to change the commit on this PR prior to it being merged.

Do you see how the profile picture from your GitHub account isn't displayed? That means that you do not have your email set in your ~/.gitconfig to one that is tied to your GitHub account.

See the suggestions in #3607 (comment) for how to fix this.

[jameslamb]

looks good to me, thanks! I'll wait a few days to hear if you want to fix the commit attribution before merging this.

[Madnex]

Thanks for the tipp! I added my email in the git config :)

For the next changes in basic.py should I keep creating PRs for each function? Or should I aggregate several commits before submitting a PR?

[jameslamb]

commits look good to me, thanks!

For the next changes in basic.py should I keep creating PRs for each function

It's ok to start grouping a few together in each PR, now that you've done a few of these.

Thanks very much for your help with this project!

[github-actions]

This pull request has been automatically locked since there has not been any recent activity since it was closed. To start a new related discussion, open a new issue at https://github.com/microsoft/LightGBM/issues including a reference to this.