BP算法三层程序，简单的程序-BP algorithm three-tier process, the simple procedures

matlab语言实现LDA模型，即：三层贝叶斯概率模型，包含词、主题和文档三层结构。运行简单，容易理解。-MATLAB language implementation of the LDA model, namely: three layer Bayesian probability model, including words, themes and documents of the three layer structure. Easy to operate, easy to underst