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enter image description hereI want to fit a LDA model using RStudio, but there are some trouble in the determination of topics number. Perplexity and coherence are suggested to do this work, so first I use LDA and perplexity command to get the perplexity vs number of topics. However, I don't find a function or package to get the coherence in RStudio. topic_coherence command in package "topicdoc" can return coherence of each topic, makes me confused, it is an array not a coherence score.

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