org.openimaj.data

Class RandomSampleDataSource<DATATYPE>

java.lang.Object

org.openimaj.data.AbstractDataSource<DATATYPE>

org.openimaj.data.IndexedViewDataSource<DATATYPE>

org.openimaj.data.RandomSampleDataSource<DATATYPE>

Type Parameters:

DATATYPE - the data type which can be returned

All Implemented Interfaces:

Iterable<DATATYPE>, DataSource<DATATYPE>

public class RandomSampleDataSource<DATATYPE>
extends IndexedViewDataSource<DATATYPE>

This DataSource provides randomly sampled view over another DataSource.

Author:

Jonathon Hare (jsh2@ecs.soton.ac.uk)

Constructor Summary

Constructors

Constructor and Description
RandomSampleDataSource(DataSource<DATATYPE> dataSource, double proportion) Construct the view over the given DataSource such that it has the given proportion of items from the original.
RandomSampleDataSource(DataSource<DATATYPE> dataSource, int requestedSize) Construct the view over the given DataSource such that it has requestedSize items.

Method Summary

Methods inherited from class org.openimaj.data.IndexedViewDataSource

getData, getData, numDimensions, numRows

Methods inherited from class org.openimaj.data.AbstractDataSource

getRandomRows, iterator

Methods inherited from class java.lang.Object

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

Constructor Detail

RandomSampleDataSource

public RandomSampleDataSource(DataSource<DATATYPE> dataSource,
                      int requestedSize)

Construct the view over the given DataSource such that it has requestedSize items.

Parameters:

dataSource - the dataSource to sample

requestedSize - the requested number of rows

Throws:

IllegalArgumentException - if the requested size is bigger than the number of rows in the datasource being sampled, or less than one.

RandomSampleDataSource

public RandomSampleDataSource(DataSource<DATATYPE> dataSource,
                      double proportion)

Construct the view over the given DataSource such that it has the given proportion of items from the original.

Parameters:

dataSource - the dataSource to sample

proportion - the proportion of rows from the original to include in the sample

Throws:

IllegalArgumentException - if the proportion is less than 0 or bigger than 1.