xgboost4j_2.12 1.1.1 API < Back
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# Packages

-  package root
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    root
-  package ml
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    root
-  package dmlc
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    ml
-  package xgboost4j
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    dmlc
-  package java
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    xgboost4j
-  package util
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    java
- Booster
- DMatrix
- ExternalCheckpointManager
- IEvaluation
- IObjective
- IRabitTracker
- Rabit
- RabitTracker
- TrackerProperties
- XGBoost
- XGBoostError

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ml.dmlc.xgboost4j.java

# IObjective 

###

#### trait IObjective extends Serializable

interface for customize Object function

Linear Supertypes
Serializable, AnyRef, Any
Known Subclasses
ObjectiveTrait
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### Abstract Value Members

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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