Add usergraph file that predicts tags using the user-tag graph
Merge branch 'master' of https://github.com/davidlizeng/cs224w-project
Minor changes to usergraph.py
Merge branch 'master' of https://github.com/davidlizeng/cs224w-project
Added the user graph tag prediction
Merge branch 'master' of https://github.com/davidlizeng/cs224w-project