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  1. Mahout
  2. MAHOUT-954

"Unpredictable" have to be represented by NaN on DF.

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      On our RandomForest src, we uses "-1" for representing "Unpredictable",
      but for regression problem, there is a case which outputs "-1" for the correct result.

      For resolving this problem, we should change the unpredictable flag to "NaN" from "-1".

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            srowen Sean R. Owen
            ikumasa mukai Ikumasa Mukai
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