Mean absolute error. :param v: np.ndarray or int, ground truth. :param v_: np.ndarray or int, prediction. :param axis: axis to do

Mean absolute percentage error. :param v: np.ndarray or int, ground truth. :param v_: np.ndarray or int, prediction. :param axis:

Mean squared error. :param v: np.ndarray or int, ground truth. :param v_: np.ndarray or int, prediction. :param axis: axis to do

:param y: array in shape of [count, time_step, node]. :param y_hat: in same shape with y. :param by_step: evaluate by time_step dim.

Mean absolute percentage error. :param v: np.ndarray or int, ground truth. :param v_: np.ndarray or int, prediction. :param axis:

Slice an array or list of arrays. This takes an array-like, or a list of array-likes, and outputs: - arrays[start:stop] if `array