top one position for this competition and actually the skin looks likely cut off in this way so initially we have only label data between a model in this first round send a predictive see the labels on the unlabeled data select on the confident ones and retrain the model general repeats is this test for example K times and at each iteration which this improvement is a sports oh yes the sports improvement are kind of degrade so it's a smaller and smaller but it should iteration gives more and more information about