feature: verbose flag in cluster.DBscan

[sloev]

would it be possible to get verbose "back" as a flag in DBscan. seems like it was there in earlier releases:

https://ogrisel.github.io/scikit-learn.org/sklearn-tutorial/modules/generated/sklearn.cluster.DBSCAN.html

[jnothman]

What verbosity would you like to see? Also @ogrisel it's not wonderful that people can land up seeing this version of the docs

[sloev]

i would like to see progress reports like this i guess:
https://stackoverflow.com/a/51876268/5324953

[jnothman]

That doesn't clarify what info you would like for dbscan

[cmarmo]

My understanding is that this issue is about propagating the verbose flag available for some of the DBSCAN algorithm (eg ball_tree and kd_tree). I'm relabeling this as "Enhancement". Feel free to close or revert if this is not correct.

[GiilDe]

I am using dbscan with large amount of data and it's frustrating to not get any feedback on progress. So, in my opinion as a user, it is important to add this feature.

[JacksonWuxs]

I believe @GiilDe suggestion is right.
Most scenarios using DBSCAN work on large dataset. Thus, a progress report is necessary and meaningful.

[BadisG]

I agree with that, DBSCAN and KNNImputer must have a verbose functionnality, those are really slow algorithm and I want to know how long it's gonna actually take