Exercise

Same k, different alpha

You are given a document-term matrix dtm describing the five-sentence corpus of two topics. You will re-run the LDA algorithm, changing the value of alpha, and compare the outcomes.

Instructions 1/2

XP

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Experiment with fitting a topic model and clicking Run Code for the following values of alpha: 0.5, 1, 2, and NULL.
When you are done, click Submit Answer with alpha equal to NULL.