private static void execute(File f, int i) throws Exception {
		int column = 0; 
		int row = 0;
		
		BufferedReader br = new BufferedReader(new FileReader(f));
		String line = null;
		System.out.println("***********" + f.getName());
		while ((line = br.readLine()) != null) {
			String[] split = line.split(splitmark);
			if (split.length < 2) continue;
			
			String annotated = split[split.length-2];
			String predicted = split[split.length-1];
			
			if(class_number.containsKey(annotated)){row = class_number.get(annotated);}
			else {
				class_number.put(annotated, classes);
				row = classes;
				classes += 1;
			}
			
			if(class_number.containsKey(predicted)){column = class_number.get(predicted);}
			else {
				class_number.put(predicted, classes);
				column = classes;
				classes += 1;
			}
			
			cm[row][column] += 1;
		}
		br.close();		
		
	}