org.locationtech.geowave.analytic.sample.function

Class CentroidDistanceBasedSamplingRankFunction<T>

java.lang.Object

org.locationtech.geowave.analytic.sample.function.CentroidDistanceBasedSamplingRankFunction<T>

Type Parameters:

T - The data type for the object being sampled

All Implemented Interfaces:

SamplingRankFunction<T>

public class CentroidDistanceBasedSamplingRankFunction<T>
extends Object
implements SamplingRankFunction<T>

Rank objects using their distance to the closest centroid of a set of centroids. The specific rank is determined by the probability of the point meeting being a centroid, modeled in the implementation of SampleProbabilityFn.

The farther the distance, the higher the rank. Properties:

"CentroidDistanceBasedSamplingRankFunction.KMeansConfig.data_store_configuration" - The class used to determine the prefix class name for te GeoWave Data Store parameters for a connection to collect the starting set of centroids. Defaults to CentroidDistanceBasedSamplingRankFunction.

"CentroidDistanceBasedSamplingRankFunction.KMeansConfig.probability_function" - implementation of SampleProbabilityFn

"CentroidDistanceBasedSamplingRankFunction.KMeansConfig.distance_function" - DistanceFn

"CentroidDistanceBasedSamplingRankFunction.KMeansConfig.centroid_factory" - AnalyticItemWrapperFactory to wrap the centroid data with the appropriate centroid wrapper AnalyticItemWrapper

See GeoWaveConfiguratorBase for information for configuration GeoWave Data Store for consumption of starting set of centroids.

Field Summary

Fields

Modifier and Type	Field and Description
protected AnalyticItemWrapperFactory<T>	itemWrapperFactory
protected static org.slf4j.Logger	LOGGER

Constructor Summary

Constructors

Constructor and Description
CentroidDistanceBasedSamplingRankFunction()

Method Summary

Modifier and Type	Method and Description
void	initialize(org.apache.hadoop.mapreduce.JobContext context, Class<?> scope, org.slf4j.Logger logger)
double	rank(int sampleSize, T value)
static void	setParameters(org.apache.hadoop.conf.Configuration config, Class<?> scope, PropertyManagement runTimeProperties)

Methods inherited from class java.lang.Object

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

Field Detail

LOGGER

protected static final org.slf4j.Logger LOGGER

itemWrapperFactory

protected AnalyticItemWrapperFactory<T> itemWrapperFactory

Constructor Detail

CentroidDistanceBasedSamplingRankFunction

public CentroidDistanceBasedSamplingRankFunction()

Method Detail

setParameters

public static void setParameters(org.apache.hadoop.conf.Configuration config,
                                 Class<?> scope,
                                 PropertyManagement runTimeProperties)

initialize

public void initialize(org.apache.hadoop.mapreduce.JobContext context,
                       Class<?> scope,
                       org.slf4j.Logger logger)
                throws IOException

Specified by:

initialize in interface SamplingRankFunction<T>

Throws:

IOException

rank

public double rank(int sampleSize,
                   T value)

Specified by:

rank in interface SamplingRankFunction<T>