"Unpredictable" have to be represented by NaN on DF.
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Key: MAHOUT-954
URL: https://issues.apache.org/jira/browse/MAHOUT-954
Project: Mahout
Issue Type: Bug
Components: Classification
Reporter: Ikumasa Mukai
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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