org.apache.flink.graph.library.metric.undirected.VertexMetricsTest.java Source code

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Here is the source code for org.apache.flink.graph.library.metric.undirected.VertexMetricsTest.java

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/*
 * 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.flink.graph.library.metric.undirected;

import org.apache.commons.math3.util.CombinatoricsUtils;
import org.apache.flink.graph.asm.AsmTestBase;
import org.apache.flink.graph.library.metric.undirected.VertexMetrics.Result;
import org.apache.flink.types.IntValue;
import org.apache.flink.types.LongValue;
import org.apache.flink.types.NullValue;
import org.junit.Test;

import static org.junit.Assert.assertEquals;

public class VertexMetricsTest extends AsmTestBase {

    @Test
    public void testWithSimpleGraph() throws Exception {
        Result expectedResult = new Result(6, 7, 13, 4, 6);

        Result vertexMetrics = new VertexMetrics<IntValue, NullValue, NullValue>().run(undirectedSimpleGraph)
                .execute();

        assertEquals(expectedResult, vertexMetrics);
    }

    @Test
    public void testWithCompleteGraph() throws Exception {
        long expectedDegree = completeGraphVertexCount - 1;
        long expectedEdges = completeGraphVertexCount * expectedDegree / 2;
        long expectedMaximumTriplets = CombinatoricsUtils.binomialCoefficient((int) expectedDegree, 2);
        long expectedTriplets = completeGraphVertexCount * expectedMaximumTriplets;

        Result expectedResult = new Result(completeGraphVertexCount, expectedEdges, expectedTriplets,
                expectedDegree, expectedMaximumTriplets);

        Result vertexMetrics = new VertexMetrics<LongValue, NullValue, NullValue>().run(completeGraph).execute();

        assertEquals(expectedResult, vertexMetrics);
        assertEquals(expectedDegree, vertexMetrics.getAverageDegree(), ACCURACY);
        assertEquals(1.0f, vertexMetrics.getDensity(), ACCURACY);
    }

    @Test
    public void testWithEmptyGraph() throws Exception {
        Result expectedResult;

        expectedResult = new Result(0, 0, 0, 0, 0);

        Result withoutZeroDegreeVertices = new VertexMetrics<LongValue, NullValue, NullValue>()
                .setIncludeZeroDegreeVertices(false).run(emptyGraph).execute();

        assertEquals(expectedResult, withoutZeroDegreeVertices);
        assertEquals(Float.NaN, withoutZeroDegreeVertices.getAverageDegree(), ACCURACY);
        assertEquals(Float.NaN, withoutZeroDegreeVertices.getDensity(), ACCURACY);

        expectedResult = new Result(3, 0, 0, 0, 0);

        Result withZeroDegreeVertices = new VertexMetrics<LongValue, NullValue, NullValue>()
                .setIncludeZeroDegreeVertices(true).run(emptyGraph).execute();

        assertEquals(expectedResult, withZeroDegreeVertices);
        assertEquals(0.0f, withZeroDegreeVertices.getAverageDegree(), ACCURACY);
        assertEquals(0.0f, withZeroDegreeVertices.getDensity(), ACCURACY);
    }

    @Test
    public void testWithRMatGraph() throws Exception {
        Result expectedResult = new Result(902, 10442, 1003442, 463, 106953);

        Result withoutZeroDegreeVertices = new VertexMetrics<LongValue, NullValue, NullValue>()
                .run(undirectedRMatGraph).execute();

        assertEquals(expectedResult, withoutZeroDegreeVertices);
    }
}