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I'm trying to implement a topic model using a Latent Dirichlet allocation (LDA) algorithm. I'm using sentences as my dataset. What is Ck in the given instructions?

The instructions are as follows: For dataset D: Run LDA with k topics on D to produce assignment matrix Ck

Its on page 29 of this pdf http://sambrody.info/Lectures/Brody_aspect-sentiment_Google.pdf

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It's the matrix that assigns topics to each document. You can use it to look up which documents have a give topic and which topics are found in a given document.

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