There are variables X_train, X_test, y_train, y_test created through sklearn train_test_split. They contain text data in string format. Convert them to float numbers.

def str_to_float(train, test):
    train = [float(x) for x in train]
    test = [float(x) for x in test]
    return train, test
    
X_train, X_test = str_to_float(X_train, X_test)
y_train, y_test = str_to_float(y_train, y_test)

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