Utilities

index_calculator_helper(i, pred_l, ...)	A helper function for index_calculator, it is used for canculating the index of one row, i.e. one test data proximity to all training data.
_predict_probability_at_times(uniq_times, ...)	A helper function for predict_probability_at_times, it is used for one dimensional array
predict_probability_at_times(uniq_times, ...)	Predict the probability at times