ground truth for what is real other augmentation of the same image and then you just build this contrast loss and back prop so that does basically the idea of the instance discrimination so where does momentum come in here so the idea of momentum is to make sure that you're not you can use a slowly varying encoder of the same and you basically have an encoder which is used to encode your queries but your keys are going to use a pol yet a historically average version of the same encoder and this gives you lots of