Class AliasSamplerDoubleInt

java.lang.Object

io.nosqlbench.virtdata.library.basics.core.stathelpers.AliasSamplerDoubleInt

All Implemented Interfaces:

DoubleToIntFunction

public class AliasSamplerDoubleInt
extends Object
implements 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(List<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 Details

RECORD_LEN

public static int RECORD_LEN

Constructor Details

AliasSamplerDoubleInt

public AliasSamplerDoubleInt(List<EvProbD> events)

Method Details

applyAsInt

public int applyAsInt(double value)

Specified by:

applyAsInt in interface DoubleToIntFunction