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This is a C implementation of variational EM for latent Dirichlet allocation (LDA), a topic model for text or other discrete data. LDA allows you to analyze of corpus, and extract the topics that combined to form its documents. For example, click here to see the topics estimated from a small corpus of Associated Press documents. LDA is fully described in Blei et al. (2003).

This code contains:

• an implementation of variational inference for the per-document topic proportions and per-word topic assignments
• a variational EM procedure for estimating the topics and exchangeable Dirichlet hyperparameter

View the readme.txt and fork or clone the repository.

2246 documents from the Associated Press download.

Top 20 words from 100 topics estimated from the AP corpus pdf.

To learn about bug-fixes, updates, and discuss LDA and related techniques, please join the topic-models mailing list, topic-models [at] lists.cs.princeton.edu.

To join, click here.

There are several other implementations of LDA on the web:

• R package
• The Mallet Toolkit from UMass
• Gregor Heinrich's LDA-J
• Multinomial PCA