nl.tudelft.graphalytics.giraph.algorithms.pr.PageRankComputationTest.java Source code

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Here is the source code for nl.tudelft.graphalytics.giraph.algorithms.pr.PageRankComputationTest.java

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/*
 * Copyright 2015 Delft University of Technology
 *
 * Licensed 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 nl.tudelft.graphalytics.giraph.algorithms.pr;

import nl.tudelft.graphalytics.domain.algorithms.PageRankParameters;
import nl.tudelft.graphalytics.giraph.GiraphTestGraphLoader;
import nl.tudelft.graphalytics.validation.GraphStructure;
import nl.tudelft.graphalytics.validation.algorithms.pr.PageRankOutput;
import nl.tudelft.graphalytics.validation.algorithms.pr.PageRankValidationTest;
import org.apache.giraph.conf.GiraphConfiguration;
import org.apache.giraph.graph.Vertex;
import org.apache.giraph.utils.InternalVertexRunner;
import org.apache.giraph.utils.TestGraph;
import org.apache.hadoop.io.DoubleWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;

import java.util.HashMap;
import java.util.Map;

/**
 * @author Tim Hegeman
 */
public class PageRankComputationTest extends PageRankValidationTest {

    @Override
    public PageRankOutput executeDirectedPageRank(GraphStructure graph, PageRankParameters parameters)
            throws Exception {
        GiraphConfiguration configuration = new GiraphConfiguration();
        configuration.setComputationClass(PageRankComputation.class);
        configuration.setMasterComputeClass(PageRankMasterComputation.class);
        configuration.setWorkerContextClass(PageRankWorkerContext.class);
        PageRankConfiguration.DAMPING_FACTOR.set(configuration, parameters.getDampingFactor());
        PageRankConfiguration.NUMBER_OF_ITERATIONS.set(configuration, parameters.getNumberOfIterations());

        TestGraph<LongWritable, DoubleWritable, NullWritable> inputGraph = GiraphTestGraphLoader
                .createGraph(configuration, graph, new DoubleWritable(), NullWritable.get());

        TestGraph<LongWritable, DoubleWritable, NullWritable> result = InternalVertexRunner
                .runWithInMemoryOutput(configuration, inputGraph);

        Map<Long, Double> pageRanks = new HashMap<>();
        for (Map.Entry<LongWritable, Vertex<LongWritable, DoubleWritable, NullWritable>> vertexEntry : result
                .getVertices().entrySet()) {
            pageRanks.put(vertexEntry.getKey().get(), vertexEntry.getValue().getValue().get());
        }

        return new PageRankOutput(pageRanks);
    }

    @Override
    public PageRankOutput executeUndirectedPageRank(GraphStructure graph, PageRankParameters parameters)
            throws Exception {
        return executeDirectedPageRank(graph, parameters);
    }

}