info.debatty.java.lsh.examples.MinHashExample Maven / Gradle / Ivy
/*
* The MIT License
*
* Copyright 2015 Thibault Debatty.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package info.debatty.java.lsh.examples;
import info.debatty.java.lsh.MinHash;
import java.util.TreeSet;
/**
*
* @author Thibault Debatty
*/
public class MinHashExample {
public static void main(String[] args) {
// Initialize the hash function for an similarity error of 0.1
// For sets built from a dictionary of 5 items
MinHash minhash = new MinHash(0.1, 5);
// Sets can be defined as an vector of booleans:
// [1 0 0 1 0]
boolean[] vector1 = {true, false, false, true, false};
int[] sig1 = minhash.signature(vector1);
// Or as a set of integers:
// set2 = [1 0 1 1 0]
TreeSet set2 = new TreeSet();
set2.add(0);
set2.add(2);
set2.add(3);
int[] sig2 = minhash.signature(set2);
System.out.println("Signature similarity: " + minhash.similarity(sig1, sig2));
System.out.println("Real similarity (Jaccard index)" +
MinHash.jaccardIndex(MinHash.convert2Set(vector1), set2));
}
}