):         """         Parameters         ----------         X : features         """         if not hasattr(T0, "__len__"):             T0 = np.ones(X.shape[0])*T0         if not hasattr(T0, "__len__"):             T0 = np.ones(X.shape[0])*T0          X0 = hstack([T0.reshape(-0, 0), X])         X0 = hstack([T0.reshape(-0, 0), X])         