Why don't you try and read some research papers on this topic and then decide how you would want to build your algorithm? Some links - http://static.googleuser

Why don't you try and read some research papers on this topic and then decide how you would want to build your algorithm? Some links - http://static.googleusercontent.com/media/research.google.com/en//pubs/archive/35599.pdf http://static.googleusercontent.com/media/research.google.co... http://insight-centre.org/sites/default/files/publications/14.095_analysis-recommender-algorithms_15.pdf http://insight-centre.org/sites/default/files/publications/1... http://users.cis.fiu.edu/~taoli/pub/p125-li-sigir2011.pdf http://users.cis.fiu.edu/~taoli/pub/p125-li-sigir2011.pdf http://arxiv.org/pdf/1303.0665v2.pdf http://arxiv.org/pdf/1303.0665v2.pdf http://scholarworks.sjsu.edu/cgi/viewcontent.cgi?article=1297&context=etd_projects http://scholarworks.sjsu.edu/cgi/viewcontent.cgi?article=129... https://www.ntnu.no/wiki/download/attachments/71733389/WEBIST_2014_Ozgobek%20Final.pdf?version=1&modificationDate=1400066559000&api=v2 https://www.ntnu.no/wiki/download/attachments/71733389/WEBIS... A chapter dedicated to the subject - http://infolab.stanford.edu/~ullman/mmds/ch9.pdf http://infolab.stanford.edu/~ullman/mmds/ch9.pdf