We use Eratosthenes sieve for prime factorization, storing the primes in an array. But for that, we need to find the primes less than or equal to sqrt(n) which divide n. There are about n/log(n) primes less than or equal to n. So, the complexity is roughly sqrt(n)/log(sqrt(n)...
M. Pollard, Factorization of the eighth Fermat number, Math. Comput., 36(1981) 627–630; MR 83h:10014. Google Scholar John Brillhart and G. D. Johnson, On the factors of certain Mersenne numbers, I, II Math. Comput.,14(1960) 365–369, 18(1964) 87–92; MR 23#A832, 28#2992....
2014-10-16 @Jay_GraphLab: 经过一年多努力,GraphLab Create正式发布1.0:单机轻松处理海量图表/图(graph)/文本/图像(image)数据;机器学习模块包括推荐系统/社交网络/文本分析/最近邻搜索,还有前沿的BoostedTrees/DeepLearning/FactorizationMachine/LDA等模型;模型可以简单地被推送到云端,作为网站/App后台的智能预测服务...