2013/7/28 Oğuz Yarımtepe <[email protected]>:
> I had read the scikit preprocessing issues and it seems i shoudl have used
> DictVectoricer to encode my categorical string values after i put them in a
> dict format. But i am not sure how i will use the resulting output at the
> random forest code.
What you get from DictVectorizer is a sparse matrix containing one-hot
coded categorical values (booleans). Random forests don't support
those, but fortunately they (should) handle categorical values without
one-hot coding, so you do something like
np.unique(column, return_inverse=True)
on each column containing categorical values. The second return value
of this contains an integer index representation of the column.
--
Lars Buitinck
Scientific programmer, ILPS
University of Amsterdam
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