/*
* Hivemall: Hive scalable Machine Learning Library
*
* Copyright (C) 2013-2014
* National Institute of Advanced Industrial Science and Technology (AIST)
* Registration Number: H25PRO-1520
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package hivemall.knn.lsh;
import hivemall.knn.distance.PopcountUDF;
import java.math.BigInteger;
import java.util.Arrays;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.junit.Assert;
import org.junit.Test;
public class bBitMinHashUDFTest {
@Test
public void test() throws HiveException {
bBitMinHashUDF bbminhash = new bBitMinHashUDF();
PopcountUDF popcnt = new PopcountUDF();
String a1 = bbminhash.evaluate(Arrays.asList("a", "b", "c"), false).toString();
String a2 = bbminhash.evaluate(Arrays.asList("a", "b"), false).toString();
Assert.assertFalse("a1: " + a1, bigint(a1).compareTo(bigint(0L)) < 0);
Assert.assertFalse("a2: " + a2, bigint(a2).compareTo(bigint(0L)) < 0);
Assert.assertTrue(popcnt.evaluate(a1, a2).get() > 0);
String b1 = bbminhash.evaluate(Arrays.asList("a"), false).toString();
String b2 = bbminhash.evaluate(Arrays.asList("b", "c"), false).toString();
Assert.assertFalse("b1: " + b1, bigint(b1).compareTo(bigint(0L)) < 0);
Assert.assertFalse("b2: " + b2, bigint(b2).compareTo(bigint(0L)) < 0);
Assert.assertTrue(popcnt.evaluate(a1, a2).get() > popcnt.evaluate(b1, b2).get());
String c1 = bbminhash.evaluate(Arrays.asList("a", "b", "c", "d", "e"), false).toString();
String c2 = bbminhash.evaluate(Arrays.asList("b", "c", "e", "d"), false).toString();
Assert.assertTrue(popcnt.evaluate(c1, c2).get() > popcnt.evaluate(a1, a2).get());
}
private static BigInteger bigint(long l) {
return BigInteger.valueOf(l);
}
private static BigInteger bigint(String s) {
return new BigInteger(s);
}
}