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ichernob2015-06-20 14:29:36
big data
ichernob, 2015-06-20 14:29:36

How to calculate perplexity?

How to calculate topic model perplexity? There is an implementation of the LDA model, which receives a set of text documents as input, and returns a set of topics as output, and each topic contains a set of word-number pairs. I found several formulas, but I never figured out what some elements mean in them, and there is no one to find out from.
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