very very difficult problem and previous work has has done a lot of engineering on this like building detectors and then kind of you want to classify every single pixel here and then you you you get like two detection right here that are very close for the same classes they are that must maybe be the same instance right so there's only one thing here and not things and so on so there there used to be very complicated architectures that solve these problems and this paper here comes up with a super simple architecture and we'll kind of go from