Probabilistic Latent Semantic Analysis [closed]

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I am looking for any tutorial or implementation of PLSA in java. There is a similar question in this link https://stackoverflow.com/questions/16396463/probabilistic-latent-semantic-analysis-indexing-in-java , however, there is no reply to this query swell. I have watched a talk on PLSA by Thomas Hoffman, however I can't seem to get my head around the implementation. Any help would be appreciated.

Answer 1

Well according to wikipedia:

P(w,d) = \sum_c P(c) P(d|c) P(w|c) = P(d) \sum_c P(c|d) P(w|c) 

That is the formula you need to implement.

Further, the EM algorithm is what you need. If you don't understand the algorithm or the function you cannot successfully be a consumer of it.