code: public static void binaryToText(String featuresFolder, final String featureType, int featureLength)
  			throws Exception {
  		// read the folder containing the description files
  		File dir = new File(featuresFolder);
  		FilenameFilter filter = new FilenameFilter() {
  			public boolean accept(File dir, String name) {
  				if (name.endsWith("." + featureType + "b"))
  					return true;
  				else
  					return false;
  			}
  		};
  		String[] files = dir.list(filter);
  
  		for (int i = 0; i < files.length; i++) {
  			if (i % 100 == 0) {
  				System.out.println("Converting file " + i);
  			}
  
  			DataInputStream in = new DataInputStream(new BufferedInputStream(new FileInputStream(
  					featuresFolder + files[i])));
  			BufferedWriter out = new BufferedWriter(new FileWriter(new File(featuresFolder
  					+ files[i].replace("b", ""))));
  			long counter = 0;
  			while (true) {
  				try {
  					double val = in.readDouble();
  					out.write(String.valueOf(val));
  				} catch (EOFException e) {
  					break;
  				}
  				counter++;
  				if (counter % featureLength == 0) {
  					out.write("\n");
  				} else {
  					out.write(",");
  				}
  
  			}
  			in.close();
  			out.close();
  		}
  	}
docs: Takes a folder with feature files in binary format and converts them to text.
  
  @param featuresFolder
  @param featureType
  @param featureLength
  @throws Exception