错误Y_pred此LinearRegression实例尚未拟合。在使用此估计器之前使用适当的参数调用“fit”

Question

从Sklearn.model_selection导入train_test_split X_train,X_test,y_train,y_test,=train_test_split（X,y,test_size=0.2)

lr=linear_model.linearregression()

x_train=x_train。重塑（-1,1）

Y_pred=lr.predict(X_test)

Answer 1

在代码中，您没有调用fit。您需要在声明linearregression模型后调用它，如下所示：

from sklearn.model_selection import train_test_split
from sklearn.linear_model import LinearRegression

X_train, X_test, y_train, y_test, = train_test_split(X, y, test_size=0.2)
X_train= X_train.reshape(-1, 1)

lr = LinearRegression().fit(X_train, y_train)  # fit should be used here
Y_pred = lr.predict(X_test) # prediction stage