Package generic.lsh.vector

Class WeightFactory

  • public class WeightFactory
extends java.lang.Object

    • Constructor Detail

      • WeightFactory

        public WeightFactory()

    • Method Detail

      • getIDFSize

        public final int getIDFSize()
        Returns:
        number of weights in the IDF portion of the table

      • getTFSize

        public final int getTFSize()
        Returns:
        number of weights in the TF portion of the table

      • getSize

        public final int getSize()
        Returns:
        number of floating-point entries needed to serialize the factory

      • getIDFWeight

        public final double getIDFWeight​(short val)
        Parameters:
        val -
        Returns:
        the IDF weight at the given position

      • getTFWeight

        public final double getTFWeight​(short val)
        Parameters:
        val - is the term count (-1)
        Returns:
        the TF weight for the given count

      • getCoeff

        public final double getCoeff​(short i,
                             short t)
        Given an IDF position and a TF count, build the feature coefficient
        Parameters:
        i - is the IDF position
        t - is the TF count
        Returns:
        the feature coefficient

      • getWeightNorm

        public final double getWeightNorm()
        Returns:
        the weight normalization factor

      • getFlipNorm0

        public final double getFlipNorm0()
        Returns:
        the first feature flip penalty parameter

      • getDiffNorm0

        public final double getDiffNorm0()
        Returns:
        the first feature drop penalty parameter

      • getFlipNorm1

        public final double getFlipNorm1()
        Returns:
        the second feature flip penalty parameter

      • getDiffNorm1

        public final double getDiffNorm1()
        Returns:
        the second feature drop penalty parameter

      • getScale

        public final double getScale()
        Returns:
        the final score scaling factor

      • getAddend

        public final double getAddend()
        Returns:
        the final score addend

      • setLogarithmicTFWeights

        public void setLogarithmicTFWeights()

      • saveXml

        public void saveXml​(java.io.Writer fwrite)
             throws java.io.IOException
        Serialize this object as XML to a Writer
        Parameters:
        fwrite - is the Writer
        Throws:
        java.io.IOException

      • toArray

        public double[] toArray()
        Condense weight table down to array of doubles
        Returns:
        array of doubles

      • set

        public void set​(double[] weightArray)
        Initialize the WeightTable from an array of doubles
        Parameters:
        weightArray -

      • restoreXml

        public void restoreXml​(XmlPullParser parser)
        Build (deserialize) this object from an XML stream
        Parameters:
        parser - is the XML parser