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Posted to dev@mahout.apache.org by "Sebastian Schelter (JIRA)" <ji...@apache.org> on 2011/09/21 20:03:09 UTC

[jira] [Assigned] (MAHOUT-815) LDA Inference Corrections, Alpha (Dirichlet) Estimation

     [ https://issues.apache.org/jira/browse/MAHOUT-815?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sebastian Schelter reassigned MAHOUT-815:
-----------------------------------------

    Assignee: Sebastian Schelter

> 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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