Warning 1：
源代码：
from sklearn.cross_validation import train_test_split from sklearn.decomposition import RandomizedPCA from sklearn.grid_search import GridSearchCV
警告信息：
D:\python35\lib\site-packages\sklearn\cross_validation.py:44: DeprecationWarning: This module was deprecated in version 0.18 in favor of the model_selection module into which all the refactored classes and functions are moved. Also note that the interface of the new CV iterators are different from that of this module. This module will be removed in 0.20. "This module will be removed in 0.20.", DeprecationWarning) D:\python35\lib\site-packages\sklearn\grid_search.py:43: DeprecationWarning: This module was deprecated in version 0.18 in favor of the model_selection module into which all the refactored classes and functions are moved. This module will be removed in 0.20. DeprecationWarning) D:\python35\lib\site-packages\sklearn\utils\deprecation.py:52: DeprecationWarning: Class RandomizedPCA is deprecated; RandomizedPCA was deprecated in 0.18 and will be removed in 0.20. Use PCA(svd_solver='randomized') instead. The new implementation DOES NOT store whiten ``components_``. Apply transform to get them. warnings.warn(msg, category=DeprecationWarning)
改正后代码：
from sklearn.model_selection import train_test_split from sklearn.decomposition import PCA from sklearn.model_selection import GridSearchCV