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https://issues.apache.org/jira/browse/FLINK-2254?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15723143#comment-15723143
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ASF GitHub Bot commented on FLINK-2254:
---------------------------------------
Github user greghogan commented on a diff in the pull request:
https://github.com/apache/flink/pull/2564#discussion_r90926409
--- Diff:
flink-libraries/flink-gelly/src/main/java/org/apache/flink/graph/BipartiteGraph.java
---
@@ -0,0 +1,364 @@
+/*
+ * 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;
+
+import org.apache.flink.api.common.functions.FilterFunction;
+import org.apache.flink.api.common.functions.MapFunction;
+import org.apache.flink.api.java.DataSet;
+import org.apache.flink.api.java.ExecutionEnvironment;
+import org.apache.flink.api.java.functions.KeySelector;
+import org.apache.flink.api.java.tuple.Tuple2;
+
+/**
+ *
+ * Bipartite graph is a graph whose vertices can be divided into two
disjoint sets: top vertices and bottom vertices.
+ * Edges can only exist between a pair of vertices from different vertices
sets. E.g. there can be no vertices between
+ * a pair of top vertices.
+ *
+ * <p>Bipartite graphs are useful to represent graphs with two sets of
objects, like researchers and their publications,
+ * where an edge represents that a particular publication was authored by
a particular author.
+ *
+ * <p>Bipartite interface is different from {@link Graph} interface, so to
apply algorithms that work on a regular graph
+ * a bipartite graph should be first converted into a {@link Graph}
instance. This can be achieved by using
+ * {@link BipartiteGraph#projectionTopSimple()} or
+ * {@link BipartiteGraph#projectionBottomFull()} methods.
+ *
+ * @param <KT> the key type of the top vertices
+ * @param <KB> the key type of the bottom vertices
+ * @param <VVT> the top vertices value type
+ * @param <VVB> the bottom vertices value type
+ * @param <EV> the edge value type
+ */
+public class BipartiteGraph<KT, KB, VVT, VVB, EV> {
+ private final ExecutionEnvironment context;
+ private final DataSet<Vertex<KT, VVT>> topVertices;
+ private final DataSet<Vertex<KB, VVB>> bottomVertices;
+ private final DataSet<BipartiteEdge<KT, KB, EV>> edges;
+
+ private BipartiteGraph(
+ DataSet<Vertex<KT, VVT>> topVertices,
+ DataSet<Vertex<KB, VVB>> bottomVertices,
+ DataSet<BipartiteEdge<KT, KB, EV>> edges,
+ ExecutionEnvironment context) {
+ this.topVertices = topVertices;
+ this.bottomVertices = bottomVertices;
+ this.edges = edges;
+ this.context = context;
+ }
+
+ /**
+ * Create bipartite graph from datasets.
+ *
+ * @param topVertices dataset of top vertices in the graph
--- End diff --
Extra space.
> Add Bipartite Graph Support for Gelly
> -------------------------------------
>
> Key: FLINK-2254
> URL: https://issues.apache.org/jira/browse/FLINK-2254
> Project: Flink
> Issue Type: New Feature
> Components: Gelly
> Affects Versions: 0.10.0
> Reporter: Andra Lungu
> Assignee: Ivan Mushketyk
> Labels: requires-design-doc
>
> A bipartite graph is a graph for which the set of vertices can be divided
> into two disjoint sets such that each edge having a source vertex in the
> first set, will have a target vertex in the second set. We would like to
> support efficient operations for this type of graphs along with a set of
> metrics(http://jponnela.com/web_documents/twomode.pdf).
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