There is a limitation of LDA: it fail to directly model correlation between topics. Because it makes an assumption that the presence of one topic is not related with other topics, which in reality is not applicable.(Blei et al. A Correlated Topic Model of Science) However, because of this assumption, we can use Dirichlet to efficiently improve our algorithm using conjugation.
Also, I began to read collaborative topic modeling for news recommendation. Later will introduce the Collaborative topic regression(CTR)
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