image and that way you're able to learn really rich features it's very similar to the CPC area done at a patch level except that you're not actually doing any spatial prediction you're all you're trying to do is identify another version of the same image and this is in general referred to the principle of instances combination and to reason people have really taken this far one paper is called Boco or momentum contrast and other paper is called sim clr or simple contrast of learning for representations for vision and we're