[scikit-learn] A necessary feature for Decision trees

[Brown J.B.]

Dear Yang Li,

> Neither the classificationTree nor the regressionTree supports
categorical feature. That means the Decision trees model can only accept
continuous feature.

Consider either manually encoding your categories in bitstrings (e.g.,
"Facebook" = 001, "Twitter" = 010, "Google" = 100), or using OneHotEncoder
to do the same thing for you automatically.

Cheers,
J.B.
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