/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.giraph.examples;
import org.apache.giraph.conf.GiraphConfiguration;
import org.apache.giraph.edge.ByteArrayEdges;
import org.apache.giraph.utils.InternalVertexRunner;
import org.junit.Test;
import java.util.Map;
import static org.junit.Assert.assertEquals;
/**
* Tests for {@link PageRankVertex}
*/
public class PageRankVertexTest {
/**
* A local integration test on toy data
*/
@Test
public void testToyData() throws Exception {
// A small graph
String[] graph = new String[] {
"1 4 2 3",
"2 1",
"4 3 2",
"5 2 4"
};
GiraphConfiguration conf = new GiraphConfiguration();
conf.setInt(RandomWalkWithRestartVertex.MAX_SUPERSTEPS, 50);
conf.setFloat(RandomWalkWithRestartVertex.TELEPORTATION_PROBABILITY, 0.15f);
conf.setVertexClass(PageRankVertex.class);
conf.setOutEdgesClass(ByteArrayEdges.class);
conf.setVertexInputFormatClass(LongDoubleNullTextInputFormat.class);
conf.setVertexOutputFormatClass(
VertexWithDoubleValueNullEdgeTextOutputFormat.class);
conf.setWorkerContextClass(RandomWalkWorkerContext.class);
conf.setMasterComputeClass(RandomWalkVertexMasterCompute.class);
// Run internally
Iterable<String> results = InternalVertexRunner.run(conf, graph);
Map<Long, Double> steadyStateProbabilities =
RandomWalkTestUtils.parseSteadyStateProbabilities(results);
assertEquals(0.28159076008518047, steadyStateProbabilities.get(1l),
RandomWalkTestUtils.EPSILON);
assertEquals(0.2514648601529863, steadyStateProbabilities.get(2l),
RandomWalkTestUtils.EPSILON);
assertEquals(0.22262961972286327, steadyStateProbabilities.get(3l),
RandomWalkTestUtils.EPSILON);
assertEquals(0.17646783276703806, steadyStateProbabilities.get(4l),
RandomWalkTestUtils.EPSILON);
assertEquals(0.06784692727193153, steadyStateProbabilities.get(5l),
RandomWalkTestUtils.EPSILON);
}
}