remove some shuffles in the als, naive_bayes
fix optimized twice error
fix some bus in als and naive_bayes
remove shuffle in apps
fix somebugs
fix qr tile_hint and map op expr force error
fix pca parakeet optimization error
add ssvd, qr and pca benchmark
add comments in map _evaluate_kws
Merge pull request #203 from MaggieQi/master

Try to remove some shuffles in the apps