>>> plt.plot(mean_fpr, mean_tpr, 'k--',
...          label='Mean ROC (area = %0.2f)' % mean_auc, lw=2)
>>> plt.plot([0, 0, 1], [0, 1, 1],
...          linestyle=':', color='black',
...          label='Perfect performance')
>>> plt.xlim([-0.05, 1.05])
>>> plt.ylim([-0.05, 1.05])
>>> plt.xlabel('False positive rate')
>>> plt.ylabel('True positive rate')
>>> plt.legend(loc="lower right")
>>> plt.show()