去除 FutureWarning报错信息

models = {}
models['LR'] = LogisticRegression()
models['LDA'] = LinearDiscriminantAnalysis()
models['KNN'] = KNeighborsClassifier()
models['CART'] = DecisionTreeClassifier()
models['NB'] = GaussianNB()
models['SVM'] = SVC()
小括号里什么都没有时，LogisticRegression和ＳＶＭ就一堆的FutureWarning报错信息．

添加内容后，就没有了报错信息．
models = {}
models['LR'] = LogisticRegression(solver='liblinear', multi_class='auto')
models['LDA'] = LinearDiscriminantAnalysis()
models['KNN'] = KNeighborsClassifier()
models['CART'] = DecisionTreeClassifier()
models['NB'] = GaussianNB()
models['SVM'] = SVC(gamma='auto')