Re: KMeans - Evaluation Results

> Say I start with the Clusterer class, I create a ClustererImpl class which
> is the internal class that Clusterer points to. But since Clusterer is
> abstract, and KMeans inherits from Clusterer, how do I maintain the
> inheritance and do the same for KMeans?

I think the following links could serve as a reference:
https://github.com/xapian/xapian/blob/master/xapian-letor/include/xapian-letor/feature.h
https://github.com/xapian/xapian/tree/master/xapian-letor/feature

Here `Feature` is an abstract base class.