/**
* 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);
}
}