Package elki.datasource.filter.normalization.instancewise

Class LengthNormalization<V extends elki.data.NumberVector>

  • Type Parameters:
    V - vector type
    All Implemented Interfaces:
    elki.datasource.bundle.BundleStreamSource, Normalization<V>, elki.datasource.filter.ObjectFilter, elki.datasource.filter.StreamFilter
    public class LengthNormalization<V extends elki.data.NumberVector>
extends AbstractVectorStreamConversionFilter<V,​V>
implements Normalization<V>
    Class to perform a normalization on vectors to norm 1.
    Since:
    0.5.0
    Author:
    Heidi Kolb, Erich Schubert

    • Field Detail

      • norm

        elki.distance.Norm<? super V extends elki.data.NumberVector> norm
        Norm to use.

      • map

        it.unimi.dsi.fastutil.ints.Int2DoubleOpenHashMap map
        Map used if converting sparse vectors.

    • Constructor Detail

      • LengthNormalization

        public LengthNormalization​(elki.distance.Norm<? super V> norm)
        Constructor.
        Parameters:
        norm - Norm to use

    • Method Detail

      • filterSingleObject

        protected V filterSingleObject​(V featureVector)
        Description copied from class: AbstractStreamConversionFilter
        Normalize a single instance. You can implement this as UnsupportedOperationException if you override both public "normalize" functions!
        Specified by:
        filterSingleObject in class AbstractStreamConversionFilter<V extends elki.data.NumberVector,​V extends elki.data.NumberVector>
        Parameters:
        featureVector - Database object to normalize
        Returns:
        Normalized database object

      • convertedType

        protected elki.data.type.SimpleTypeInformation<? super V> convertedType​(elki.data.type.SimpleTypeInformation<V> in)
        Description copied from class: AbstractStreamConversionFilter
        Get the output type from the input type after conversion.
        Specified by:
        convertedType in class AbstractStreamConversionFilter<V extends elki.data.NumberVector,​V extends elki.data.NumberVector>
        Parameters:
        in - input type restriction
        Returns:
        output type restriction