private Tree GroupByClass()
{
var groupings = Instances.DistinctBy(i => i.Output.Value)
.ToDictionary(i => i.Features.First(), j => new Tree
{
Leaf = j.Output
});
if (groupings.Count() > 1)
{
return(new Tree
{
Branches = groupings
});
}
return(new Tree
{
Leaf = groupings.First().Value.Leaf
});
}