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https://issues.apache.org/jira/browse/MAHOUT-684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13672252#comment-13672252
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Jake Mannix commented on MAHOUT-684:
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This code is based on the old LDA impl we had, which has since been removed
entirely. This patch is no longer valid, and if we wanted to do something like
this in the collapsed vb impl we have now, it would need to be revisited from
scratch. I think there are also other techniques for learning the
regularization parameter via fixed point iterations, but I haven't looked into
the details of implementing it in a distributed fashion.
> Topics regularization for LDA
> -----------------------------
>
> Key: MAHOUT-684
> URL: https://issues.apache.org/jira/browse/MAHOUT-684
> Project: Mahout
> Issue Type: Improvement
> Components: Clustering
> Reporter: Vasil Vasilev
> Assignee: Jake Mannix
> Priority: Minor
> Labels: LDA.
> Fix For: 0.8
>
> Attachments: MAHOUT-684.patch, MAHOUT-684.patch, MAHOUT-684.patch
>
>
> Implementation provided for the alpha parameters estimation as described in
> the paper of Blei, Ng and Jordan
> (http://www.cs.princeton.edu/~blei/papers/BleiNgJordan2003.pdf).
> Remark: there is a mistake in the last formula in A.4.2 (the signs are
> wrong). The correct version is described here:
> http://www.cs.cmu.edu/~jch1/research/dirichlet/dirichlet.pdf (page 6).
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