二维list转数组时，出现list([]) list([])
reason：list长度不一
example：我是因为前面re匹配少了‘ ’导致有一些数据没被分开，长度较短
pos_label=1 is not a valid label. It should be one of [‘1’, ‘2’]
solution：print (‘Recall: %.4f’ % metrics.recall_score(y_test,y_pred))
→
to
→print (‘Recall: %.4f’ % metrics.recall_score(y_test,y_pred,pos_label=“1”))
