title: Implementing Latent Dirichlet Allocation (LDA) with PyMC
body: <p>PyMC comes with numerous examples but LDA, which is a relatively simple graphical model, is not one of them. There are questions on numerous sites about this but never any references to implementations. I've considered how it might be implemented but it's not clear how PyMC would be used to establish the topic-word dependencies within each document.</p>
  
  <p>Can LDA be implemented relatively easily with PyMC?</p>