code: public BufferedReader openModelFile() {
  	String filename = modelDir + File.separator + modelFile;
  	BufferedReader fin = null;
  	
  	try {
  	    fin = new BufferedReader(new InputStreamReader(new FileInputStream(filename), "UTF-8"));
  	    
  	} catch (IOException e) {
  	    System.out.println(e.toString());
  	    return null;
  	}
  	
  	return fin;	
      }
docs: Open model file.
  
  @return the buffered reader