complicated systems it's just a big lookup table you know a smart job but you might run on the internet and it can give you surprisingly far so there's a problem with working with these word to word co-occurrence matrices they're huge so let's say we have a million word vocabulary so we have a million words by a million words just to have the full version naively and then you might store it with in 32 hopefully you don't need them in 64 so that's four bytes so storing this whole matrix in memory in a dense representation is four terabytes