@Override
	public void loadFromFile(String trainFile, String testFile, String quizFile, String featureFile) 
	{
		System.out.print("Loading dataset... ");
		try 
		{
			if(trainFile != null && trainFile.length() > 0);
				loadDataFromFile(trainFile, InstanceType.Train);
			if(testFile != null && testFile.length() > 0)
				loadDataFromFile(testFile, InstanceType.Test);
			if(quizFile != null && quizFile.length() > 0)
				loadDataFromFile(quizFile, InstanceType.Quiz);
			if(featureFile != null && featureFile.length() > 0)
				loadFeatureFromFile(featureFile);
			
		} 
		catch (IOException e) 
		{
			e.printStackTrace();
		}
		System.out.println(this.toString());
	}