# from mlwpy import *로 가려진
# 라이브러리 import 구문은 다음과 같습니다
# from sklearn import (datasets, neighbors,
#                      model_selection as skms,
#                      linear_model, metrics)
# 자세한 내용은 부록 A를 참고하세요

linreg = linear_model.LinearRegression()
diabetes = datasets.load_diabetes()

scores = []
for r in range(10):
    tts = skms.train_test_split(diabetes.data, diabetes.target, test_size=.25)

    (diabetes_train_ftrs, diabetes_test_ftrs,
     diabetes_train_tgt, diabetes_test_tgt) = tts

    fit = linreg.fit(diabetes_train_ftrs, diabetes_train_tgt)
    preds = fit.predict(diabetes_test_ftrs)

    score = metrics.mean_squared_error(diabetes_test_tgt, preds)
    scores.append(score)

scores = pd.Series(np.sqrt(sorted(scores)))
df = pd.DataFrame({'RMSE':scores})
df.index.name = 'Repeat'
display(df.T)