On 06/03/2013 05:19 AM, Joel Nothman wrote: > > However, in these last two cases, the number of possible splits at a > single node is linear in the number of categories. Selecting an > arbitrary partition allows exponentially many splits with respect to > the number of categories (though there may be approximations to avoid > evaluating all possible splits; I'm not familiar with the literature). > I think the standard split is asking whether a variable is equal to a value, i.e. selecting subsets of 1. That is possible to do with two thresholds, but leads to a weird tree in a way.
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