说明：  一位国内大牛对于LatentDirichletAllocation算法的理解笔记，在看原论文不懂的情况下先看看这个对于算法的理解很有帮助。
(Daniel, a national understanding of the algorithm for LatentDirichletAllocation notes, see the original papers in the case do not understand take a look at this very helpful for understanding the algorithm.)