From b7e28fa451511b3b0f849c3d2919ac9c2e4231a1 Mon Sep 17 00:00:00 2001 From: Ankur Dave Date: Thu, 29 May 2014 15:39:25 -0700 Subject: initial version of LPA A straightforward implementation of LPA algorithm for detecting graph communities using the Pregel framework. Amongst the growing literature on community detection algorithms in networks, LPA is perhaps the most elementary, and despite its flaws it remains a nice and simple approach. Author: Ankur Dave Author: haroldsultan Author: Harold Sultan Closes #905 from haroldsultan/master and squashes the following commits: 327aee0 [haroldsultan] Merge pull request #2 from ankurdave/label-propagation 227a4d0 [Ankur Dave] Untabify 0ac574c [haroldsultan] Merge pull request #1 from ankurdave/label-propagation 0e24303 [Ankur Dave] Add LabelPropagationSuite 84aa061 [Ankur Dave] LabelPropagation: Fix compile errors and style; rename from LPA 9830342 [Harold Sultan] initial version of LPA --- .../spark/graphx/lib/LabelPropagationSuite.scala | 45 ++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 graphx/src/test/scala/org/apache/spark/graphx/lib/LabelPropagationSuite.scala (limited to 'graphx/src/test') diff --git a/graphx/src/test/scala/org/apache/spark/graphx/lib/LabelPropagationSuite.scala b/graphx/src/test/scala/org/apache/spark/graphx/lib/LabelPropagationSuite.scala new file mode 100644 index 0000000000..61fd0c4605 --- /dev/null +++ b/graphx/src/test/scala/org/apache/spark/graphx/lib/LabelPropagationSuite.scala @@ -0,0 +1,45 @@ +/* + * 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.spark.graphx.lib + +import org.scalatest.FunSuite + +import org.apache.spark.graphx._ + +class LabelPropagationSuite extends FunSuite with LocalSparkContext { + test("Label Propagation") { + withSpark { sc => + // Construct a graph with two cliques connected by a single edge + val n = 5 + val clique1 = for (u <- 0L until n; v <- 0L until n) yield Edge(u, v, 1) + val clique2 = for (u <- 0L to n; v <- 0L to n) yield Edge(u + n, v + n, 1) + val twoCliques = sc.parallelize(clique1 ++ clique2 :+ Edge(0L, n, 1)) + val graph = Graph.fromEdges(twoCliques, 1) + // Run label propagation + val labels = LabelPropagation.run(graph, n * 4).cache() + + // All vertices within a clique should have the same label + val clique1Labels = labels.vertices.filter(_._1 < n).map(_._2).collect.toArray + assert(clique1Labels.forall(_ == clique1Labels(0))) + val clique2Labels = labels.vertices.filter(_._1 >= n).map(_._2).collect.toArray + assert(clique2Labels.forall(_ == clique2Labels(0))) + // The two cliques should have different labels + assert(clique1Labels(0) != clique2Labels(0)) + } + } +} -- cgit v1.2.3