scikit-learn使用 数据处理 数据标准化 1 2 3 4 5 6 7 from sklearn.preprocessing import StandardScaler scaler = StandardScaler() scaler.fit(x_train) x_train_scaled = scaler.transform(x_train) x_val_scaled = scaler.transform(x_val) PCA降维 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 print(x_train_scaled.shape) #