default_target_attribute missing in data 40992

[giuseppec]

Hi,

according to openml/openml-r#412 the target feature was not specified for data set here https://www.openml.org/d/40992 . We deactivated the V1 but V2 now does not provide the target. Could this be fixed in V2 or do we have to upload V3?

[giuseppec]

And: Do we really want to allow uploading of tasks if the target is not specified? If yes, I have to make a fix in the R package.

[janvanrijn]

In my perception, default target attribute has always been a mandatory field.

(Apparently I am wrong on this:
https://github.com/openml/OpenML/blob/master/openml_OS/views/pages/api_new/v1/xsd/openml.data.upload.xsd )

But I wouldn't mind making it mandatory, let's discuss (there are some complications due to multi-target tasks)

[giuseppec]

+1 for making it mandatory, @mfeurer , @joaquinvanschoren do you guys see any disadvantages here?

[mfeurer]

What would you do for completely unsupervised data? Besides that, I do not really have an opinion on this.

[giuseppec]

Ok, for specific tasks where a target is required (classification, regression) etc. it should be mandatory. For unsupervised stuff it could be left out?

[joaquinvanschoren]

No, clustering datasets do not have a target feature...

On Mon, 19 Mar 2018 at 16:00 Giuseppe Casalicchio ***@***.***> wrote: Ok, for specific tasks where a target is required (classification, regression) etc. it should be mandatory. For unsupervised stuff it could be left out. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#669 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABpQVzeLCSRx-2kR14ZM6P9v9GaTrpmqks5tf8gdgaJpZM4Sv2sn> .

-- Thank you, Joaquin