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Specifically in the case where I don't know anything about the documents I'm working with. I'm looking a specific number or number range.

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Typical value of alpha which is used in practice is 50/T where T is number of topics and value of beta is 0.1 or 200/W , where W is number of words in vocabulary.

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  • $\begingroup$ where do you get the 200/W from? thanks $\endgroup$
    – Escachator
    Mar 6 '17 at 14:42
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Griffiths and Steyvers (2004) suggest a value of 50/k (where k is number of topics) for α and 0.1 for δ. (They use δ rather than beta to refer to the other hyperparameter).

Griffiths TL, Steyvers M (2004). “Finding Scientific Topics.” Proceedings of the National Academy of Sciences of the United States of America, 101, 5228–5235.

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