There's a good breakdown of the algo used at Amazon here. Useful for anyone looking at decent sized data sets: http://www.cs.umd.edu/~samir/498/Amazon-Recommen

There's a good breakdown of the algo used at Amazon here. Useful for anyone looking at decent sized data sets: http://www.cs.umd.edu/~samir/498/Amazon-Recommendations.pdf http://www.cs.umd.edu/~samir/498/Amazon-Recommendations.pdf