sklearn逻辑回归库函数直接拟合数据

from sklearn import model_selection
from sklearn.linear_model import LogisticRegression
from sklearn import metrics

# generalization of test and train set
X_train, X_test, y_train, y_test = model_selection.train_test_split(X, y, test_size=0.5, random_state=0)

# model training
log_model = LogisticRegression()
log_model.fit(X_train, y_train) 

# model testing
y_pred = log_model.predict(X_test)

# summarize the accuracy of fitting
print(metrics.confusion_matrix(y_test, y_pred))
print(metrics.classification_report(y_test, y_pred))

第一步，划分元素训练集和测试集，用model_selection。train_test_split指定分类数据集，答案，测试大小。

第二部，使用logisticRegression。fit函数来训练x_train，y-train.

第三步，测试，用logisticregression。predict（x_test）来使用测试集。

第四步，输出。