How to get started the DialogueStateTracker

This is my action file i want to fetch the specific conversation using sender_id. feedback = tracker.get_slot(“feedback”) tracker1 = DialogueStateTracker(sender_id,slots= True) events = for event in events: tracker1.update(event) event_dict = event.as_dict()

    if event_dict['event']=='bot' or event_dict['event']=='user':

I don’t know how to initiate to do there is no other documentation are available…can you please help me to find out. thank you in advance