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https://issues.apache.org/jira/browse/MAHOUT-759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13065369#comment-13065369
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Sebastian Schelter commented on MAHOUT-759:
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Hmm, I'd like to avoid to change the standard output format as it is nicely
integrated with FileItemSimilarity and takes the symmetry of the output into
account. However as I think that one of the most important things that Mahout
needs currently is ease of use IMHO, I'd propose to add an option to make
ItemSimilarity produce the output which Han wishes.
> improve the output for ItemSimilarityJob
> ----------------------------------------
>
> Key: MAHOUT-759
> URL: https://issues.apache.org/jira/browse/MAHOUT-759
> Project: Mahout
> Issue Type: Improvement
> Components: Collaborative Filtering
> Affects Versions: 0.5
> Reporter: Han Hui Wen
> Assignee: Sean Owen
> Priority: Minor
> Labels: ItemSimilarityJob,, Mahout
> Fix For: 0.6
>
>
> Now the output of ItemSimilarityJob like following:
> -7757148334301255842 8179634876330318523 0.003430531732418525
> -7748456450926673883 -4835531939219667484 0.2
> -7748456450926673883 -4314955996498817413 0.5
> -7748456450926673883 2808714190706572296 0.16666666666666666
> -7748456450926673883 6553837338030757853 0.14285714285714285
> -7748456450926673883 8751415108300656176 0.25
> -7747582778903926086 -7015341798833970389 0.05
> -7745456649800833279 -4355275072474512298 4.2444821731748726E-4
> -7743453627722079138 -3667977661496669483 0.0625
> -7743453627722079138 5506208171850960507 0.0625
> -7743453627722079138 7221367701058721462 0.0625
> -7721326863046534787 4345458182369739840 0.1111111111111111
> It's hard to store and view those similar items for one item. can we traverse
> them same as RecommenderJob like following:
> -9220680374247203656
> [1352180348488328600:2.5,-7757148334301255842:2.5,-7490490145790861630:2.5,-2522983126042570313:2.5,-6799281597153282746:2.5,2068144185705723774:2.5,-6007350693723349387:2.5,-6926986971196173463:2.5,5406899818760113425:2.5,-1490410533166829581:2.5,-27094582027403342:2.5,5665136340246000627:2.5]
> -9218599019595753787
> [7535853797920985421:2.5,6375444791143058470:2.5,-6278686364859964742:2.5,4842183991621375854:2.5,-5371123101058190798:2.5,8606934083257321678:2.5,8043580185091202137:2.5,5264973095582397115:2.5,1990532764981555035:2.5,5406899818760113425:2.5,-5208048021997301514:2.5,-5565838412826072017:2.5]
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