edu.indiana.d2i.htrc.util.VectorInspection.java Source code

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Here is the source code for edu.indiana.d2i.htrc.util.VectorInspection.java

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/*
#
# Copyright 2012 The Trustees of Indiana University
#
# Licensed 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.
#
# -----------------------------------------------------------------
#
# Project: knn
# File:  VectorInspection.java
# Description:  
#
# -----------------------------------------------------------------
# 
*/

package edu.indiana.d2i.htrc.util;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.SequenceFile;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.apache.mahout.math.VectorWritable;

/**
 * It is used to inspect the vectors after transformation of text or cluster result 
 */
public class VectorInspection extends Configured implements Tool {
    private static final Log logger = LogFactory.getLog(VectorInspection.class);

    @Override
    public int run(String[] args) throws Exception {
        String input = args[0];
        String output = args[1];

        int numVector = 0;
        Set<Integer> dimLst = new HashSet<Integer>();

        Configuration conf = getConf();
        FileSystem fs = FileSystem.get(conf);
        FileStatus[] status = fs.listStatus(new Path(input), Utilities.HIDDEN_FILE_FILTER);
        Text key = new Text();
        VectorWritable value = new VectorWritable();
        BufferedWriter writer = new BufferedWriter(new FileWriter(output));
        for (int i = 0; i < status.length; i++) {
            SequenceFile.Reader seqReader = new SequenceFile.Reader(fs, status[i].getPath(), conf);
            while (seqReader.next(key, value)) {
                numVector++;
                dimLst.add(value.get().size());
                writer.write(value.toString() + "\n");
            }
        }

        logger.info("#vector: " + numVector);
        logger.info("number of different dimensions: " + dimLst.size());
        StringBuilder builder = new StringBuilder();
        for (Integer dim : dimLst)
            builder.append(dim + " ");
        logger.info("" + builder.toString());

        writer.close();

        return 0;
    }

    public static void main(String[] args) throws Exception {
        ToolRunner.run(new Configuration(), new VectorInspection(), args);
        System.exit(0);
    }
}