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Posted to dev@mahout.apache.org by "Sebastian Schelter (JIRA)" <ji...@apache.org> on 2010/08/15 20:26:17 UTC

[jira] Updated: (MAHOUT-460) Add "maxPreferencesPerItemConsidered" option to o.a.m.cf.taste.hadoop.similarity.item.ItemSimilarityJob

     [ https://issues.apache.org/jira/browse/MAHOUT-460?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sebastian Schelter updated MAHOUT-460:
--------------------------------------

    Attachment: MAHOUT-460.patch

> Add "maxPreferencesPerItemConsidered" option to o.a.m.cf.taste.hadoop.similarity.item.ItemSimilarityJob
> -------------------------------------------------------------------------------------------------------
>
>                 Key: MAHOUT-460
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-460
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Collaborative Filtering
>            Reporter: Sebastian Schelter
>         Attachments: MAHOUT-460.patch
>
>
> Because "coocurrence algorithms ... scale in the square of the number of occurrences most popular item" (Ted wrote that in a recent mail) we should offer a parameter to the ItemSimilarity job that makes it limit the number of considered preferences per item. RecommenderJob already has such an option.

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