Beginning-Of-Stream (BOS) symbol of NHP?

[HaochenWang1243]

Hi. Is the BOS symbol mechanism of NHP implemented? By reading the documentation of EasyTPP, I feel that the first event in each sequence in a processed dataset must have 'time_since_start': 0 and 'time_since_last_event': 0, which I think is not necessary with the BOS symbol mechanism implemented since the first event at t=0 is always the BOS event. Thank you.