[GitHub] flink pull request #2986: [FLINK-4648] Implement BipartiteGraph generator

[greghogan <gi...@git.apache.org>]

Github user greghogan commented on a diff in the pull request:

    https://github.com/apache/flink/pull/2986#discussion_r103018907
  
    --- Diff: flink-libraries/flink-gelly/src/main/java/org/apache/flink/graph/bipartite/generator/CompleteBipartiteGraph.java ---
    @@ -0,0 +1,109 @@
    +/*
    + * 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.bipartite.generator;
    +
    +import org.apache.flink.api.common.functions.FlatMapFunction;
    +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.tuple.Tuple2;
    +import org.apache.flink.graph.Vertex;
    +import org.apache.flink.graph.bipartite.BipartiteEdge;
    +import org.apache.flink.graph.bipartite.BipartiteGraph;
    +import org.apache.flink.graph.generator.GraphGeneratorUtils;
    +import org.apache.flink.types.LongValue;
    +import org.apache.flink.types.NullValue;
    +import org.apache.flink.util.Collector;
    +import org.apache.flink.util.LongValueSequenceIterator;
    +
    +/**
    + * Generate a complete bipartate graph where every top node is connected to every bottom node.
    + */
    +public class CompleteBipartiteGraph
    +	extends AbstractBipartiteGraphGenerator<LongValue, LongValue, NullValue, NullValue, NullValue> {
    +
    +	// Required to create the DataSource
    +	private final ExecutionEnvironment env;
    +
    +	// Required configuration
    +	private final long topVertexCount;
    +	private final long bottomVertexCount;
    +
    +	public CompleteBipartiteGraph(ExecutionEnvironment env, long topVertexCount, long bottomVertexCount) {
    +		this.env = env;
    +		this.topVertexCount = topVertexCount;
    +		this.bottomVertexCount = bottomVertexCount;
    +	}
    +
    +	@Override
    +	public BipartiteGraph<LongValue, LongValue, NullValue, NullValue, NullValue> generate() {
    +		DataSet<Vertex<LongValue, NullValue>> topVertices
    +			= GraphGeneratorUtils.vertexSequence(env, parallelism, topVertexCount);
    +		DataSet<Vertex<LongValue, NullValue>> bottomVertices
    +			= GraphGeneratorUtils.vertexSequence(env, parallelism, bottomVertexCount);
    +
    +		LongValueSequenceIterator iterator = new LongValueSequenceIterator(0, bottomVertexCount - 1);
    +
    +		DataSet<BipartiteEdge<LongValue, LongValue, NullValue>> edges =  env
    +				.fromParallelCollection(iterator, LongValue.class)
    +				.setParallelism(parallelism)
    +			.name("Bottom vertices iterator")
    +			.flatMap(new EdgesToAllTopVertices(topVertexCount))
    +				.setParallelism(parallelism)
    +				.name("Complete graph edges");
    +
    +		return BipartiteGraph.fromDataSet(topVertices, bottomVertices, edges, env);
    +	}
    +
    +	private static class EdgeGenerator
    --- End diff --
    
    Is this class unused?


---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---