change inference to use test set
change inference to use test set

So people can download the predictions.csv and upload to kaggle
slai11/youtube-8m,hxkk/u8m_test,forwchen/yt8m,KangHsi/youtube-8m,slai11/youtube-8m,KangHsi/youtube-8m,slai11/youtube-8m,forwchen/yt8m,mwoodson1/youtube-8m-competition,slai11/youtube-8m,google/youtube-8m,lidalei/youtube-8m,coded5282/youtube-8m