Examples of org.apache.mahout.graph.AdjacencyMatrixJob$VectorizeEdgesMapper

org.apache.mahout.graph.AdjacencyMatrixJob
kipedia.org/wiki/Adjacency_matrix
This job outputs {@link org.apache.hadoop.io.SequenceFile}s an {@link IntWritable} as key and a {@link VectorWritable} as value
Command line arguments specific to this class are:
1. --output=(path): output path where the resulting matrix and the number of vertices should be written
2. --vertices=(path): file containing a list of all vertices
3. --edges=(path): Directory containing edges of the graph
4. --symmetric = (boolean) produce a symmetric adjacency matrix (corresponds to an undirected graph)
General command line options are documented in {@link AbstractJob}.

Note that because of how Hadoop parses arguments, all "-D" arguments must appear before all other arguments.

    Path transitionMatrixPath = getTempPath("transitionMatrix");
    Path vertexIndexPath = getTempPath(AdjacencyMatrixJob.VERTEX_INDEX);
    Path numVerticesPath = getTempPath(AdjacencyMatrixJob.NUM_VERTICES);


    /* create the adjacency matrix */
    ToolRunner.run(getConf(), new AdjacencyMatrixJob(), new String[] { "--vertices", parsedArgs.get("--vertices"),
        "--edges", parsedArgs.get("--edges"), "--output", getTempPath().toString() });


    int numVertices = HadoopUtil.readInt(numVerticesPath, getConf());
    Preconditions.checkArgument(numVertices > 0);

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