我正在通过Python Data Science Essentials (2nd Edition)工作 .
该书提供以下代码:
chosen_random_state = 1
X_train, X_test, y_train, y_test = cross_validation.train_test_split(X, y, test_size=0.30, ran-dom_state=chosen_random_state)
print ("(X train shape %s, X test shape %s, \ny train shape %s, y test shape %s" \
% (X_train.shape, X_test.shape, y_train.shape, y_test.shape))
h1.fit(X_train,y_train)
print (h1.score(X_test,y_test))
当我尝试运行它时,我收到以下错误:
------------------------------------------------- -------------------------- NameError Traceback(最近一次调用last)in()1 chosen_random_state = 1 ----> 2 X_train,X_test ,y_train,y_test = cross_validation.train_test_split(X,y,test_size = 0.30,random_state = chosen_random_state)3 print(“(X列车形状%s,X测试形状%s,\ ny列车形状%s,y测试形状%s) “%(X_train.shape,X_test.shape,y_train.shape,y_test.shape))4 h1.fit(X_train,y_train)5 print(h1.score(X_test,y_test))NameError:名称'cross_validation'未定义
我怀疑我可能要导入一本书没有提及的图书馆 . 我搜索了手册,但找不到这个功能 . 这是我需要创建的功能还是有人可以指向相关的库?
3 回答
你应该导入
确保你已经安装了sklearn . 有关如何安装的说明,请参见this
cross_validation
的子模块sklearn
是deprecated . 你应该使用module_selection
instead你必须导入: