Maxo like that ubiquitous so maybe this is about a comparative or contrastive method for training generative models where you compare sentences and know that like one should have higher probability than the other there was one one paper for reps in tation learning perspective which it's not quite the generative model side but it's representation learning CPC you know is that whole family of contrast methods is dominating you know unsupervised learning for image representations so it's somewhat of a contrast where in NLP