Mahout Source Analysis of Distributedlanczossolver (i) Actual combat

Mahout version: 0.7,hadoop version: 1.0.4,jdk:1.7.0_25 64bit.

This chapter begins the series SVD, namely descending dimension. This can be directly run in the Mahout mahout_home/mahout/svd-h to see the algorithm call parameters, or in the official website of the corresponding page can also be seen, the actual use of the SVD call parameters are as follows:

Package MAHOUT.FANSY.SVD;  
      
Import Org.apache.mahout.math.hadoop.decomposer.DistributedLanczosSolver;  
      
public class Runsvd {  
      
    /** 
     * calls SVD algorithm 
     * @throws Exception
    /public static void Main (string[) args) thr oWS Exception {  
        string[] arg=new string[]{"-jt", "ubuntu:9001", "-fs", "ubuntu:9000",  
                "I", "Hdfs://ubuntu : 9000/svd/input/wind ",  
                "-O "," Hdfs://ubuntu:9000/svd/output ",  
                "-nr "," 178 ","-nc ",", ","  
                R "," 3 ",  
                "-sym", "Square",  
                "--CLEANSVD", "true",  
                "--tempdir", "Hdfs://ubuntu:9000/svd/temp"
        };  
        Distributedlanczossolver.main (ARG);  
    }  
      
}

Before running this algorithm, you need to convert the input data, such as using the following input data:

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