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:

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static final int
    MAX_LEAF_VALUE
    The max (absolute) supported value an optimized leaf may have
    static final 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)
     
    final Value
    evaluate(Context context)
    Returns the value of evaluating this expression over the given context.
    int
    hashCode()
    Returns a hashcode computed from the data in this
    StringBuilder
    toString(StringBuilder string, SerializationContext context, Deque<String> path, CompositeNode parent)
    Returns "(optimized condition tree)"
    final com.yahoo.tensor.TensorType
    type(com.yahoo.tensor.evaluation.TypeContext<Reference> context)
    Returns the type this will return if evaluated with the given context.
    final double[]
    values()
    Returns a direct reference to the values of this.

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

    equals, toString, toString

    Methods inherited from class java.lang.Object

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

  • Field Details

    • MAX_LEAF_VALUE

      public static final int MAX_LEAF_VALUE
      The max (absolute) supported value an optimized leaf may have
      See Also:

    • MAX_VARIABLES

      public static final int MAX_VARIABLES
      The max number of variables (features) supported in the context
      See Also:

  • Constructor Details

    • GBDTNode

      public GBDTNode(double[] values)

  • Method Details

    • 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 is a root
      Returns:
      the main script, referring to script instances.

    • hashCode

      public int hashCode()
      Description copied from class: ExpressionNode
      Returns a hashcode computed from the data in this
      Specified by:
      hashCode in class ExpressionNode