Using LDA to categorize my blog posts

My problem is that the lda/js algo i'm using returns terms with probabilities. I would like to feed the algo a list of allowed categories and it should return N categories with probas, not terms.

I'm using this : [https://github.com/primaryobjects/lda](https://github.com/primaryobjects/lda) . I don't know if Gibbs sampling is the answer.

Example of what I have at the moment: categories should be like "Life", "Society", "Art", "Business" etc... Right now the categories I have are "Traffic", "Music" and "Money".

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