won but it works really well for NLP so some of you may probably have heard of Bert okay it's gonna take on the world by storm in NLP and Bert is a special case of denoising auto-encoder where you give it a piece of text a window of a few hundred words and I know I'm at a time a window of a few hundred words umask so the the corruption consists in masking some of the words in that sentence or in that piece of text typically 15 percent of the words and then you train a giant neuron that transform a neural net which I'm not