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You can represent missing values using Float.NaN or Double.NaN.
double[] featureValues = {
1.0,
Float.NaN, // missing value0.0,
// ...
};
FVecfv = FVec.Transformer.fromArray(featureValues, false/* = do not treats zero as missing value */);
I trained model by xgboost with missing value. I don't know how to treat missing value in this tools
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