In this homework, we would like to check the performance of 1-nearest neighbor. You then try to find some R packages for nearest neighbor.
Since this data set is in a "sparse format," you may need to use read.matrix.csr of the R e1071 package to read it.
If the nearest neighbor code you found is inefficient, you may need to find others. If somehow packages in R are not fast enough, you can work on a smaller subset.
Write a short report (<= 2 pages in English) to show what you find.