18,000 classes if you if you do like a very simple like loose bound on how much information content you get you have like log 18,000 bits per image and you have 300 million of them so that ends up with about getting 300 50 megabytes of constraint on the function you can learn so this is the world's biggest data set and in terms of the correct function that we're trying to approximate with supervised learning you know we only are able to pump about from this kind of slightly naive in toyish view about 530 megabytes of information into the system