them you're basically trying to learn that hey this particular you know the legs are absent and the other version and so you're trying to learn that there's a dog here depending on the amount of random cropping and data augmentation you use the level of cheating you can afford to identify the two things with the same is lower lower and therefore you're forced to learn good features to make sure that you identify that two different images presented you are actually fundamentally the same thing compared to any other