I'm learning about Watson's NLU but I can't find any reference as to what model it's using for topic modeling. Is it LDA? pLSA? Any other? I understand the question is general, but it's very important to know what's under the hood...
What model does Watson natural language processing uses for topic modeling? LDA?
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Watson NLU categories and concepts (which I assume is what you mean by topic modeling) use custom machine learning models that do not directly correspond to either LDA or pLSA.