org.apache.derbyTesting.functionTests.tests.memorydb

Class ClusMogSQL

java.lang.Object

org.apache.derbyTesting.functionTests.tests.memorydb.ClusMog

org.apache.derbyTesting.functionTests.tests.memorydb.ClusMogSQL

public class ClusMogSQL
extends ClusMog

Simple utility to compute/recover the parameters of a mixture-of-Gaussian distribution from independent samples, using SQL.

Field Summary

Fields

Modifier and Type	Field and Description
(package private) java.sql.Connection	conn database connection
(package private) int	uniq unique ID for generating working table names

Fields inherited from class org.apache.derbyTesting.functionTests.tests.memorydb.ClusMog

bracket, max_n, mean, min_sample_size_per_cluster, n, ns, sample, var, weight

Constructor Summary

Constructors

Constructor and Description
ClusMogSQL(java.sql.Connection conn) constructor

Method Summary

Modifier and Type	Method and Description
(package private) void	cleanup() Clean up working tables after use.
void	clusterSQL(int n, double[] center, int ns, double[] sample) Compute/recover the parameters of a mixture-of-Gaussian distribution from given independent samples, using SQL.
(package private) void	download() Download the computed cluster configuration.
(package private) double	expect() (Re-)compute cluster centers while holding sample-to-cluster assignment fixed.
(package private) void	init() Initialize the EM (expectation-maximization) iterations.
(package private) void	maximize() (Re-)compute sample-to-cluster assignment while holding cluster centers fixed.
void	setUnique(int uniq) Set unique ID for this object.

Methods inherited from class org.apache.derbyTesting.functionTests.tests.memorydb.ClusMog

cluster, computeWeights, expectation, initEM, maximization, measure, printMog, random, setCenters, setSamples, uniform

Methods inherited from class java.lang.Object

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

Field Detail

conn

java.sql.Connection conn

database connection

uniq

int uniq

unique ID for generating working table names

Constructor Detail

ClusMogSQL

public ClusMogSQL(java.sql.Connection conn)

constructor

Method Detail

setUnique

public void setUnique(int uniq)

Set unique ID for this object.

clusterSQL

public void clusterSQL(int n,
                       double[] center,
                       int ns,
                       double[] sample)
                throws java.sql.SQLException

Compute/recover the parameters of a mixture-of-Gaussian distribution from given independent samples, using SQL.

Parameters:

n - number of clusters (Gaussian components) to output

center - initial cluster centers for iterative refinement

ns - number of input samples

sample - input samples; will be sorted in ascending order during use

Throws:

java.sql.SQLException

init

void init()
   throws java.sql.SQLException

Initialize the EM (expectation-maximization) iterations.

Throws:

java.sql.SQLException

expect

double expect()
       throws java.sql.SQLException

(Re-)compute cluster centers while holding sample-to-cluster assignment fixed.

Returns:

mean square error of resulting clustering configuration

Throws:

java.sql.SQLException

maximize

void maximize()
       throws java.sql.SQLException

(Re-)compute sample-to-cluster assignment while holding cluster centers fixed.

Throws:

java.sql.SQLException

download

void download()
       throws java.sql.SQLException

Download the computed cluster configuration.

Throws:

java.sql.SQLException

cleanup

void cleanup()
      throws java.sql.SQLException

Clean up working tables after use.

Throws:

java.sql.SQLException