ML之LoR&SGD：基于LoR(逻辑回归)、SGD梯度下降算法对乳腺癌肿瘤(10+1)进行二分类预测(良/恶性)

ML之LoR&SGD：基于LoR(逻辑回归)、SGD梯度下降算法对乳腺癌肿瘤(10+1)进行二分类预测(良/恶性)

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输出结果

breast-cancer size (683, 11)

训练集情况
2    344
4    168
Name: Class, dtype: int64

测试集情况
2    100
4     71
Name: Class, dtype: int64

设计思路

核心代码

from sklearn.cross_validation import train_test_split
X_train, X_test, y_train, y_test = train_test_split(data[column_names[1:10]], data[column_names[10]], test_size=0.25, random_state=33)

ss = StandardScaler()
X_train = ss.fit_transform(X_train)
X_test = ss.transform(X_test)

lr = LogisticRegression()
sgdc = SGDClassifier()

lr.fit(X_train, y_train)
lr_y_predict = lr.predict(X_test) 

sgdc.fit(X_train, y_train)
sgdc_y_predict = sgdc.predict(X_test)

lr.score(X_test, y_test))
sgdc.score(X_test, y_test))