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This is the formula in question:

Source: https://en.wikipedia.org/wiki/Latent_Dirichlet_allocation

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That is the entire corpus because, as per the explanation, $M$ is the number of documents in the collection, and the product goes over all documents, denoted by $j$.

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  • $\begingroup$ Thank you, that was my conclusion as well from reading the article. I saw a YouTube video claiming that formula is for a single document and wanted to double-check with you guys. $\endgroup$ Feb 3, 2021 at 21:31

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