Question 20
Consider the following code block:
from sklearn.linear_model import linear_regressionfrom sklearn.model_selection import cross_val_scorefrom sklearn.model_selection import ShuffleSplitlin_reg = linear_regression()shuffle_split = ShuffleSplit(n_splits=5, test_size=0.2, random_state=42)score = cross_val_score(lin_reg, X, y, cv=shuffle_split,scoring='-----------------------')Which of the following may be appropriate to be filled in the blank space?