Module io.virtdata.lib.basics
Package io.virtdata.stathelpers.aliasmethod

Class AliasSamplerDoubleInt

  • All Implemented Interfaces:
    java.util.function.DoubleToIntFunction
    public class AliasSamplerDoubleInt
extends java.lang.Object
implements java.util.function.DoubleToIntFunction
    Uses the alias sampling method to encode and sample from discrete probabilities, even over larger sets of data. This form requires a unit interval sample value between 0.0 and 1.0. Assuming the maximal amount of memory is used for distinct outcomes N, a memory buffer of N*16 bytes is required for this implementation, requiring 32MB of memory for 1M entries. This sampler should be shared between threads, and will be by default, in order to avoid many instances of a 32MB buffer on heap.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static int RECORD_LEN  

    • Constructor Summary

      Constructors 
      Constructor Description
      AliasSamplerDoubleInt​(java.util.List<io.virtdata.stathelpers.EvProbD> events)  

    • Method Summary

      Modifier and Type Method Description
      int applyAsInt​(double value)  

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Field Detail

      • RECORD_LEN

        public static int RECORD_LEN

    • Constructor Detail

      • AliasSamplerDoubleInt

        public AliasSamplerDoubleInt​(java.util.List<io.virtdata.stathelpers.EvProbD> events)

    • Method Detail

      • applyAsInt

        public int applyAsInt​(double value)
        Specified by:
        applyAsInt in interface java.util.function.DoubleToIntFunction