models or really be models all these are explicit density models and then we also covered approximate in steam models vary from our encoders the variation lower bound and then recovered implicit density model estate they can other models that I'm not being covered are not particularly popular or very used so that's the reason we focus on the more popular ones and if you have if you're if you have been and trained density models and you're figuring out which density model you should be using here are some pointers if you only care