ZhangChi
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ZhangChi
是的，同意 ```python from sklearn.model_selection import cross_val_score scores = cross_val_score(tree_reg, housing_prepared, housing_labels,scoring="neg_mean_squared_error", cv=10) tree_rmse_scores = np.sqrt(-scores) #这里把rmse_scores换成tree_rmse_scores ``` 这样，和后面的这一段 ```python display_scores(tree_rmse_scores)#这样就能对上了 ```