Compute feature distributions for nominal attributes

[joaquinvanschoren]

Currently the website shows no information on nominal attributes in a dataset with a numeric target.

See: https://www.openml.org/d/41022
Season, Series,... have no information om their distribution.

Looking at the code, we could extend models.AttributeStatistics
with a new function that returns something of the form
[[v1,v2,v3],[123],[234],[354]], i.e. the list of possible values and their corresponding counts.
That way they are in the same format as the class distributions.

Of course, something like [[v1,v2,v3],[123,234,354]] is also fine.

[janvanrijn]

Can you please review the current state of the Evaluation Engine and close this issue if this has been resolved?