Thank for sharing your project~
Based on the data split and settings of hyper-parameters in the paper, I can obtain similar classification performance on DomainNet when K = 3, but not when K = 1 (e.g., in P to R, I get 73.65 accuracy, instead of 76.1 claimed in the paper; in R to S, I get 59.655 accuracy, rather than 61.0 claimed in the paper).
Do I miss some important details ?