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https://issues.apache.org/jira/browse/MAHOUT-106?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12796011#action_12796011
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Ted Dunning commented on MAHOUT-106:
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See here: http://hadoop.apache.org/pig/releases.html

Pig 0.5 works with Hadoop 0.20.

Pig 0.4 works with Hadoop 0.18.

No version works with Hadoop 0.19 or 0.21

> PLSI/EM in pig based on hofmann's ACM 04 paper. 
> ------------------------------------------------
>
>                 Key: MAHOUT-106
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-106
>             Project: Mahout
>          Issue Type: New Feature
>          Components: Collaborative Filtering
>         Environment: Pig/Hadoop 
>            Reporter: Prasen Mukherjee
>            Assignee: Grant Ingersoll
>            Priority: Minor
>             Fix For: 0.3
>
>         Attachments: plsi_pig.patch
>
>   Original Estimate: 96h
>  Remaining Estimate: 96h
>
> Based on the following paper by hofmann : T. Hofmann Latent Semantic Models 
> for Collaborative Filtering In ACM Transactions on Information Systems, 2004, 
>  vol 22(1), pp. 89-115.

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