private GraphDate countBP_dataGraph(List<Organism> org) throws Exception {
        List< List<Double>> localError = new ArrayList<List<Double>>();
        localError = backPropagation(org);

        //for graph graph
        if (localError != null) {
            int numIterations = getNumIterations();
            GraphDate gData = new GraphDate(localError, numIterations, population.getGenerationNumber());
            return gData;
        }
        return null;
    }