simple activation function okay so these are neural networks with one hidden layer small neural networks with one hidden layer there should be a very very weak class ok in fact if the weights are really small the weights are like minus 1 1 we do have very strong Louisville but if we allow the weights to be anything we want this is still possible it's a gigantic gap in our knowledge so we don't yet understand very simple neural networks okay just even things like just one hidden layer just one hidden layer with