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http://xinsong.github.io/2014/10/13/rank_products
http://xinsong.github.io/2014/08/05/feature_discretion
http://xinsong.github.io/2014/05/04/prime_imagine_number
http://xinsong.github.io/2014/05/04/matrix
http://xinsong.github.io/2014/05/04/PLSA
http://xinsong.github.io/2014/05/01/Gibbs
http://xinsong.github.io/2014/04/29/beta
http://xinsong.github.io/2014/04/24/poisson_distribution
http://xinsong.github.io/2014/04/10/ml_concepts
http://xinsong.github.io/2014/03/27/probability_calibration
http://xinsong.github.io/2014/01/23/ml_3_principles
http://xinsong.github.io/2013/11/21/internet_financial_marketing
http://xinsong.github.io/2013/10/28/cao_z_internet_structure
http://xinsong.github.io/2013/09/06/internet_product
http://xinsong.github.io/2013/08/16/ad_auction_theory
http://xinsong.github.io/2012/10/19/face_customers
http://xinsong.github.io/2012/10/16/stirling_approximation
http://xinsong.github.io/2012/07/20/marketing_strategy
http://xinsong.github.io/2012/06/16/five_marketing_stories
http://xinsong.github.io/2012/05/18/spirit_way
http://xinsong.github.io/2012/05/18/failure_of_Karl_Max
http://xinsong.github.io/2012/05/18/answer