random forest predict function returns -1

asked 2014-01-26 05:23:26 -0600

jossyy
66 ●1 ●3 ●9

Hi,

My feature vector's size is 5. The content is filled with 1,0,-1 values... there are two classes. My train data's size is 243 and 16 of them is belong to fist class.The first class labeled with 1, the other is -1.

The predict function returns -1 always

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answered 2014-01-26 06:50:12 -0600

Nghia

1000 ●5 ●16

Your data is heavily imbalance so it puts more weight on the one with more data. Try to re-balance them by either reducing the bigger class, or inflate the smaller class (via duplication).