/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 edu.uci.jforestsx.tools;
import java.io.File;
import java.io.PrintStream;
import edu.uci.jforestsx.input.FeatureValuePair;
import edu.uci.jforestsx.input.sparse.FeatureMetaData;
import edu.uci.jforestsx.input.sparse.MetaData;
import edu.uci.jforestsx.input.sparse.MetaLineParser;
import edu.uci.jforestsx.input.sparse.SparseTextFileLine;
import edu.uci.jforestsx.input.sparse.SparseTextFileReader;
/**
* Converts a file from the Sparse format to SVM-light format.
*
* @author Yasser Ganjisaffar <ganjisaffar at gmail dot com>
*/
public class Sparse2SvmConvertor {
public static void convert(String inputFile, String outputFile) throws Exception {
SparseTextFileReader reader = new SparseTextFileReader();
reader.open(inputFile);
SparseTextFileLine line = new SparseTextFileLine();
int count = 0;
PrintStream output = new PrintStream(new File(outputFile));
StringBuilder sb = new StringBuilder();
int featureCount = 0;
while (reader.loadNextLine(line)) {
if (line.meta) {
MetaData metaData = MetaLineParser.parse(line.content);
if (metaData instanceof FeatureMetaData) {
featureCount++;
}
} else {
sb.setLength(0);
sb.append(line.target);
for (int i = 0; i < line.numPairs; i++) {
FeatureValuePair pair = line.pairs[i];
sb.append(" " + pair.featureIndex + ":" + pair.featureValue);
}
sb.append("\n");
output.print(sb.toString());
count++;
if (count % 10000 == 0) {
System.out.println("\t Processed: " + count);
}
}
}
reader.close();
}
}