ivory.ptc.driver.BuildAnchorTextInvertedIndex.java Source code

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Here is the source code for ivory.ptc.driver.BuildAnchorTextInvertedIndex.java

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/**
 * Ivory: A Hadoop toolkit for Web-scale information retrieval
 * 
 * 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.
 */

package ivory.ptc.driver;

import ivory.ptc.AnchorTextInvertedIndex;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.apache.log4j.Logger;

/**
 * Driver to build anchor text inverted index. This driver computes a
 * confidence score for target documents (i.e., potential pseudo judgments)
 * according to the provided {@link ivory.ptc.judgments.weighting.WeightingScheme}.
 *
 * @author Nima Asadi
 */
public class BuildAnchorTextInvertedIndex extends Configured implements Tool {
    private static final Logger LOG = Logger.getLogger(BuildAnchorTextInvertedIndex.class);

    private static int printUsage() {
        System.out.println("usage: [input-path] [output-path] [num-of-reducers] "
                + "[weighting-scheme-class] [weighting-scheme-params]\n"
                + " - [input-path] is the path to an (weighted) inverse webgraph w/ anchor text\n"
                + " - [weighting-scheme-params] is a list of parameters separated by \""
                + AnchorTextInvertedIndex.PARAMETER_SEPARATER + "\"");
        ToolRunner.printGenericCommandUsage(System.out);
        return -1;
    }

    @Override
    public int run(String[] args) throws Exception {
        if (args.length != 5) {
            printUsage();
            return -1;
        }

        Configuration conf = getConf();
        FileSystem fs = FileSystem.get(conf);
        // Command line arguments
        String inPath = args[0];
        String outPath = args[1];
        int numReducers = Integer.parseInt(args[2]);
        String weightingSchemeClass = args[3];
        String weightingSchemeParameters = args[4];
        int numMappers = 1;
        Path inputPath = new Path(inPath);
        if (!fs.exists(inputPath)) {
            LOG.warn("Input webgraph doesn't exist...");
            return -1;
        }

        conf.set("Ivory.InputPath", inPath);
        conf.set("Ivory.OutputPath", outPath);
        conf.setInt("Ivory.NumMapTasks", numMappers);
        conf.setInt("Ivory.NumReduceTasks", numReducers);
        conf.set("Ivory.WeightingScheme", weightingSchemeClass);
        conf.set("Ivory.WeightingSchemeParameters", weightingSchemeParameters);

        AnchorTextInvertedIndex indexTool = new AnchorTextInvertedIndex(conf);
        indexTool.run();
        return 0;
    }

    /**
     * Dispatches command-line arguments to the tool via the
     * <code>ToolRunner</code>.
     */
    public static void main(String[] args) throws Exception {
        int res = ToolRunner.run(new Configuration(), new BuildAnchorTextInvertedIndex(), args);
        System.exit(res);
    }
}