fit(x) 是对x进行训练
transform(y) 是将模型直接应用于y
fit_transform(x) 是对x进行训练后再将模型应用于x

x_test加fit，pca x_test不加fit
-4 1 0.8855240762093011 0.6501925545571245 0.7678583153832128
-4 3 0.8855236186606635 0.6508344030808729 0.7681790108707682
-4 5 0.8855236186606635 0.6508344030808729 0.7681790108707682x_test不加fit，pca x_test不加fit
-4 1 0.8855240762093011 0.6431322207958922 0.7643281485025966
-4 3 0.8855236186606635 0.6444159178433889 0.7649697682520262
-4 5 0.8855236186606635 0.6444159178433889 0.7649697682520262x_test不加fit，pca x_test加fit
-4 1 0.8855240762093011 0.5718870346598203 0.7287055554345607
-4 3 0.8855236186606635 0.5718870346598203 0.7287053266602419
-4 5 0.8855236186606635 0.5718870346598203 0.7287053266602419x_test加fit，pca x_test加fit
-4 1 0.8855240762093011 0.5686777920410783 0.7271009341251897
-4 3 0.8855236186606635 0.5673940949935815 0.7264588568271225
-4 5 0.8855236186606635 0.5673940949935815 0.7264588568271225