Package com.yahoo.searchlib.rankingexpression.evaluation.gbdtoptimization

Class GBDTNode

java.lang.Object

com.yahoo.searchlib.rankingexpression.rule.ExpressionNode

com.yahoo.searchlib.rankingexpression.evaluation.gbdtoptimization.GBDTNode

All Implemented Interfaces:

Serializable

public final class GBDTNode
extends ExpressionNode

An optimized version of a decision tree.

Author:

bratseth

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static int	MAX_LEAF_VALUE	The max (absolute) supported value an optimized leaf may have
static int	MAX_VARIABLES	The max number of variables (features) supported in the context

Constructor Summary

Constructors

Constructor	Description
GBDTNode(double[] values)

Method Summary

Modifier and Type	Method	Description
static double	evaluate(double[] values, int startOffset, Context context)
Value	evaluate(Context context)	Returns the value of evaluating this expression over the given context.
StringBuilder	toString(StringBuilder string, SerializationContext context, Deque<String> path, CompositeNode parent)	Returns "(optimized condition tree)"
com.yahoo.tensor.TensorType	type(com.yahoo.tensor.evaluation.TypeContext<Reference> context)	Returns the type this will return if evaluated with the given context.
double[]	values()	Returns a direct reference to the values of this.

Methods inherited from class com.yahoo.searchlib.rankingexpression.rule.ExpressionNode

equals, hashCode, toString, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

MAX_LEAF_VALUE

public static final int MAX_LEAF_VALUE

The max (absolute) supported value an optimized leaf may have

See Also:

Constant Field Values

MAX_VARIABLES

public static final int MAX_VARIABLES

The max number of variables (features) supported in the context

See Also:

Constant Field Values

Constructor Detail

GBDTNode

public GBDTNode(double[] values)

Method Detail

values

public final double[] values()

Returns a direct reference to the values of this. The returned array must not be modified.

type

public final com.yahoo.tensor.TensorType type(com.yahoo.tensor.evaluation.TypeContext<Reference> context)

Description copied from class: ExpressionNode

Returns the type this will return if evaluated with the given context.

Specified by:

type in class ExpressionNode

Parameters:

context - the variable type bindings to use for this evaluation

evaluate

public final Value evaluate(Context context)

Description copied from class: ExpressionNode

Returns the value of evaluating this expression over the given context.

Specified by:

evaluate in class ExpressionNode

Parameters:

context - the variable bindings to use for this evaluation

evaluate

public static double evaluate(double[] values,
                              int startOffset,
                              Context context)

toString

public StringBuilder toString(StringBuilder string,
                              SerializationContext context,
                              Deque<String> path,
                              CompositeNode parent)

Returns "(optimized condition tree)"

Specified by:

toString in class ExpressionNode

Parameters:

string - the StringBuilder that will be appended to

context - the serialization context

path - the call path to this, used for cycle detection, or null if this is a root

parent - the parent node of this, or null if it a root

Returns:

the main script, referring to script instances.