New measures RSquared and aliases rsq, rsquared need exporting

[ablaom]

Or we should export measures in a more programmatic way.

[sayantan1410]

Hello, I would like to contribute to this issue, can you please explain a bit more on what is to be done ?

[ablaom]

Well, the dead easy option is just to add RSquared, rsq, rsquared to the list here, just like we already have in the source package here. I'd be perfectly happy with this.

On the other hand, if you know some julia metaprogramming, you could replace the current nonsense with something more programmatic, so we don't have to keep adding to the list every time a new measure is added to MLJBase. Once MLJBase is imported, you can do measures() to get a table of all the measures and their properties, the relevant ones being name and instances (aliases) which you are going to interpolate into some eval(:(export $name)) calls, or whatever. You can find an example of this kind of thing here.
In this case you may need to re-arrange code so that the import calls happen before the export calls, if that isn't already the case.

[sayantan1410]

@ablaom Thank you so much, I will try to solve it in the better way possible. Will drop in a comment if I face some issue or have some problem in understanding.