org.knowceans.topics.simple
Class LdaGibbs

java.lang.Object
  org.knowceans.topics.simple.LdaGibbs

All Implemented Interfaces:

ISimpleGibbs, ISimplePpx, ISimpleQueryGibbs

public class LdaGibbs
extends java.lang.Object
implements ISimpleGibbs, ISimpleQueryGibbs, ISimplePpx

LDA Gibbs sampler: (m,k | alpha), (k,t | beta)

using standard linear-scan sampler

Author:

gregor

Constructor Summary

LdaGibbs(int[][] w, int[][] wq, int K, int V, double alpha, double beta, java.util.Random rand)
parametrise gibbs sampler

Method Summary

void	init() initialise Markov chain
void	initq() initialise Markov chain for querying
static void	main(java.lang.String[] args) test driver for mixture network Gibbs sampler
double	ppx()
void	run(int niter) run Gibbs sampler
void	runq(int niter) query Gibbs sampler
java.lang.String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

LdaGibbs

public LdaGibbs(int[][] w,
                int[][] wq,
                int K,
                int V,
                double alpha,
                double beta,
                java.util.Random rand)

parametrise gibbs sampler

Parameters:

w - word tokens

wq - word tokens (testing)

K - number of topics

V - number of terms

alpha - node A hyperparam

beta - node B hyperparam

rand - random number generator

Method Detail

main

public static void main(java.lang.String[] args)

test driver for mixture network Gibbs sampler

Parameters:

args -

init

public void init()

initialise Markov chain

Specified by:

init in interface ISimpleGibbs

initq

public void initq()

initialise Markov chain for querying

Specified by:

initq in interface ISimpleQueryGibbs

run

public void run(int niter)

run Gibbs sampler

Specified by:

run in interface ISimpleGibbs

Parameters:

niter - number of Gibbs iterations

runq

public void runq(int niter)

query Gibbs sampler

Specified by:

runq in interface ISimpleQueryGibbs

Parameters:

niter - number of Gibbs iterations

ppx

public double ppx()

Specified by:

ppx in interface ISimplePpx

Returns:

the perplexity of the last query sample

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object