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t

ml.dmlc.xgboost4j.java

IObjective

trait IObjective extends Serializable

interface for customize Object function

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ObjectiveTrait
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  1. abstract def getGradient(predicts: Array[Array[Float]], dtrain: DMatrix): List[Array[Float]]

    user define objective function, return gradient and second order gradient

    user define objective function, return gradient and second order gradient

    predicts

    untransformed margin predicts

    dtrain

    training data

    returns

    List with two float array, correspond to first order grad and second order grad

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