is usually like a neural network let's let's just say this is a neural network and in fact all of these the community has sort of standardized this to be most of the time it's something like a ResNet 50 ok so what you want to do is you want to train a neural network like a ResNet 50 to give you a good representation of the image so this would be like H and H is a vector and H is a representation of this image and the representation should be such that you can then take this representation and solve many tasks with