You cannot imagine how happy as I see this..
Finally there is somebody has a similar running time with mine.
※ 引述《rafan (@_@"""")》之銘言：
: I did a simple test for KNN written in C.
: testing 100 points with 520000 training needs about 61sec
: with optimization it can be done in 31sec (k = 9)
: (-O -mcpu=pentium4)
: in that sense, 5-cv + testing can be done in 50 hours if
: optimized. Otherwise, seems it needs 100 hours or so.