def _normal_equation(self, X, y):
        Xb = np.hstack((np.ones((X.shape[0], 1)), X))
        z = np.linalg.inv(np.dot(Xb.T, Xb))
        w = np.dot(z, np.dot(Xb.T, y))
        return w
A stand-in for `tokenize.generate_tokens`.
dataset/ETHPy150Open rasbt/mlxtend/mlxtend/regressor/linear_regression.py/LinearRegression._normal_equation--crossover with--dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/coverage/parser.py/CachedTokenizer.generate_tokens