DCF:A Dataflow-Based Collaborative Filtering Trainging Algorithm

Abstratct:描述了当前协同过滤算法两大技术alternating least square(ALS,最小二乘法)和gradient descent(GD)的确定：原文：Existing collaborative filtering techniques are implemented with either alternating least square algorithm or gradient descent (GD) algorithm. However,both of the two algorithms are not scalable because ALS suffers from high computation complexity and GD suffers from severe synchronization problem and tremendous data movement.