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https://issues.apache.org/jira/browse/MAHOUT-815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13109765#comment-13109765
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Ted Dunning commented on MAHOUT-815:
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Alex Smola has an excellent blog that might provide some interesting insights
into additional improvements:
http://blog.smola.org/post/6359713161/speeding-up-latent-dirichlet-allocation
The article that you mention here seems a bit old and the newer references that
Alex gives might be better to use.
> LDA Inference Corrections, Alpha (Dirichlet) Estimation
> -------------------------------------------------------
>
> Key: MAHOUT-815
> URL: https://issues.apache.org/jira/browse/MAHOUT-815
> Project: Mahout
> Issue Type: Improvement
> Components: Clustering
> Affects Versions: 0.6
> Reporter: Christoph Boden
> Assignee: Sebastian Schelter
>
> Hi, I am a PhD Student at TU Berlin DIMA. I am currently working on Mahouts
> LDA Implementation together with Sebastian Schelter. We identified a couple
> of points that can be fixed or improved in the current version.
> We propose to fix the inference in the expectation step of EM in accordance
> with [1], implement maximum likelihood estimation of the dirichlet
> distribution (alpha) as presented in [1] and some refacoring.
> [1]Blei, David M.; Ng, Andrew Y.; Jordan, Michael I (January 2003). Lafferty,
> John. ed. "Latent Dirichlet allocation". Journal of Machine Learning Research
> 3 (4-5): pp. 993-1022. doi:10.1162/jmlr.2003.3.4-5.993
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