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From "Sebastian Schelter (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAHOUT-358) the pref value field of output of org.apache.mahout.cf.taste.hadoop.item.RecommenderJob has negative
Date Wed, 07 Apr 2010 12:27:33 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12854452#action_12854452
] 

Sebastian Schelter commented on MAHOUT-358:
-------------------------------------------

My results looked kinda strange (maybe I got something wrong?), here's a sample output line
with negative values:

4725	[194614:8.0,178574:8.0,126959:8.0,586593851465007104:7.9832724E-28,448135168:0.0,554696704:0.0,851312640:2.92E-42,4734:0.0,26020003446784:0.0,88808125104128:0.0,143032087216128:4.9351955E-34,310771712:0.0,4192923752129888256:0.0,4211782575569502208:0.0,4678749561932482596:0.0,20431159427072:2.3857E-41,4688247212092686336:8.876E-42,4665729213955833856:8.708E-42,4665729214092410880:0.0,1339257939189301248:2.6403101E-15,0:2.9293609E10,1:1.0442734E-4,8950711844864:6.679E-42,13535:16.0,64277:16.0,69153:16.0,586593851465007104:1.0917835E-27,976241224:0.0,617497120:0.0,1011106336:2.92E-42,4789:0.0,31228707209216:0.0,526558695522304:0.0,49065706389504:4.9351955E-34,314441728:0.0,1592866893205602304:0.0,4088986986675699712:0.0,-7932527793659705308:0.0,20637317857280:1.10651E-40,0:2.14E-42,0:1.19384E-40,136577024:0.0,1354739062908387329:-4.42924794E11,1:1.1437698E-35,1:1000460.0,8950711844864:6.746E-42,95556:10.0,95899:10.0,57319:10.0,586593851465007104:1.3505299E-27,302858528:0.0,1941520672:0.0,851312640:2.92E-42,4830:0.0,242048263258112:0.0,24366435794944:0.0,37370510442496:4.9351955E-34,317063168:0.0,2955840336133357568:1.4E-45,-7583708691820445696:1.4E-45,-7581738366983469020:0.0,20813411516416:1.8913E-41,0:1.1453E-41,0:2.1608E-41,136577024:0.0,1365998061976813570:1.4776256E22,1:5.119846E-28,2:4.1850966E-16,8950711844864:6.81E-42,64277:28.0,9896:8.0,3413:8.0,586593851465007104:1.6408307E-27,187580704:0.0,3670688032:0.0,9150873888:2.92E-42,4873:0.0,8199092568064:0.0,17575006175232:0.0,124906238902272:4.9351955E-34,319946752:1.4E-45,-8312447406524334080:1.4E-45,7469291587688726528:0.0,7912896013545768996:0.0,20998095110144:9.0071E-41,4701758010974797824:3.6774E-41,4683743612465315840:3.9393E-41,4683743612601892864:0.0,1378101485975371776:3.0353137E-30,1:2.05131665E13,1:-5.0857293E-33,8950711844864:6.869E-42,59216:0.0,116360:0.0,157916:0.0,586593851465007104:2.1709452E-27,803487936:0.0,2247311552:0.0,1256407232:2.92E-42,4916:0.0,36443890122752:0.0,42048822444032:0.0,53443370680320:4.9351955E-34,322699264:0.0,-7921760551166803968:0.0,1148417904979476480:0.0,2630102182384371748:0.0,21152713932800:2.8324E-41,4692750811720056832:1.37956E-40,4692750811720056832:4.403E-41,4692750811856633856:0.0,1388516060113666048:126.626465,1:-4.649059E-16,0:5.2475385E-17,8950711844864:6.934E-42,30298:10.0,6835:10.0,30668:10.0,586593851465007104:2.802034E-27,1062420672:0.0,766525632:0.0,1404453056:2.92E-42,4966:0.0,71154723192832:0.0,71373766524928:0.0,17987323035648:4.9351955E-34,326303744:0.0,8632346981731139584:0.0,5418464838655410176:2.8E-45]


> the pref value  field of output of org.apache.mahout.cf.taste.hadoop.item.RecommenderJob
has negative
> -----------------------------------------------------------------------------------------------------
>
>                 Key: MAHOUT-358
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-358
>             Project: Mahout
>          Issue Type: Test
>          Components: Collaborative Filtering
>    Affects Versions: 0.4
>            Reporter: Hui Wen Han
>         Attachments: 20100407_steer_item_out_part-00000, 2010_input_steer_item_in_prefs-1.dat,
attempt_201004011623_0070_m_000000_0.htm, screenshot-1.jpg, screenshot-2.jpg, screenshot-3.jpg
>
>
> In my test the input pref values all is positive.
> the output score value has negative value ,

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