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https://issues.apache.org/jira/browse/MAHOUT-905?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen updated MAHOUT-905:
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Resolution: Not A Problem
Status: Resolved (was: Patch Available)
> CachingUserSimilarity and CachingItemSimilarity have wrong (far to small)
> default maxSizes
> ------------------------------------------------------------------------------------------
>
> Key: MAHOUT-905
> URL: https://issues.apache.org/jira/browse/MAHOUT-905
> Project: Mahout
> Issue Type: Improvement
> Components: Collaborative Filtering
> Affects Versions: 0.5
> Environment: Mac OS X 10.6.8
> java version "1.6.0_29"
> Java(TM) SE Runtime Environment (build 1.6.0_29-b11-402-10M3527)
> Java HotSpot(TM) 64-Bit Server VM (build 20.4-b02-402, mixed mode)
> This does not matter should be reproducible on every system.
> Reporter: Manuel Blechschmidt
> Assignee: Sean Owen
> Priority: Minor
> Labels: caching, max, similarity
> Attachments: CachingSimilariyAdjustedDefaultSize.patch
>
> Original Estimate: 0.5h
> Remaining Estimate: 0.5h
>
> I am currently tuning my recommender discussed here:
> http://thread.gmane.org/gmane.comp.apache.mahout.user/10433.
> As a first step I wrapped my LogLikelihoodSimilarity with an
> CachingUserSimilarity. I used Java Visual VM to profile the calls. I
> recognized that I didn't get any performance benefits. So I had a look into
> the code.
> Actually line 47 this(similarity, dataModel.getNumItems()); in
> CachingUserSimilarity.java is wrong. If we want to cache all item
> similarities we need a cache with
> (dataModel.getNumItems()*(dataModel.getNumItems()-1))/2 possible entries.
> I am now doing this in the constructor. I attached a patch to adjust this in
> the trunk build.
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