xgboost::ObjInfo Struct Reference

A struct returned by objective, which determines task at hand. The struct is not used by any algorithm yet, only for future development like categorical split. More...

#include <task.h>

Public Types
enum	Task : uint8_t {   kRegression = 0 , kBinary = 1 , kClassification = 2 , kSurvival = 3 ,   kRanking = 4 , kOther = 5 }

Public Member Functions
	ObjInfo (Task t)
	ObjInfo (Task t, bool khess, bool zhess)
XGBOOST_DEVICE bool	UpdateTreeLeaf () const
	Use adaptive tree if the objective doesn't have valid hessian value.

Data Fields
enum xgboost::ObjInfo::Task	task
bool	const_hess {false}
bool	zero_hess {false}

Detailed Description

A struct returned by objective, which determines task at hand. The struct is not used by any algorithm yet, only for future development like categorical split.

The task field is useful for tree split finding, also for some metrics like auc. Lastly, knowing whether hessian is constant can allow some optimizations like skipping the quantile sketching.

This struct should not be serialized since it can be recovered from objective function, hence it doesn't need to be stable.

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The documentation for this struct was generated from the following file:

• External/xgboost/include/xgboost/task.h