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https://issues.apache.org/jira/browse/MAHOUT-358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12854568#action_12854568
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Hui Wen Han edited comment on MAHOUT-358 at 4/7/10 4:15 PM:
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it's very good now,thanks Sean! :)
only one little issue ,can ignore line that has no recommendations ?
-2146704409350804772
[-5143306609724270245:0.0,-6887672525304767274:0.0,-7869337437647864448:0.0,1143520528292887196:0.0,4565256005884091248:0.0,-403573745216718449:0.0]
-2140684086652787668
[5066321748533664330:3.33,-6196380629601347193:2.22,1388936500341917293:2.22,-5143306609724270245:2.22,-6887672525304767274:2.22,-403573745216718449:2.22,4000074642144994975:0.0,1471545749001003492:0.0,8619821060300841906:0.0,-8796495370659715938:0.0]
-2087578807957211564 [3693944382462874249:0.0]
-2084997234534227590 []
-1994184181161252808 []
-1956807977260853620 []
-1905139778468734800 []
-1897443610249479948 []
-1861747039795463904 []
-1783644832320395644 []
-1759587438285537664 []
-1598157027497721376 []
-1524111942416072322 []
-1508995658783890206 []
-1478238285808155750 []
-1473372051895027798 []
-1360993164612489840 []
-1170376071408489552 [-8608197272004918866:0.0,-8235449048613678861:0.0]
-1106281807063652538 []
It seems that
vector.iterateNonZero() can not skip the zero value.
also in UserVectorToCooccurrenceReducer, the following code seems does not
need.
because some user has little preferences,if we purge here ,maybe he can not get
recommendation.
Iterator<Vector.Element> cooccurrences = cooccurrenceRow.iterateNonZero();
while (cooccurrences.hasNext()) {
Vector.Element element = cooccurrences.next();
if (element.get() <= 1.0) { // purge small values
element.set(0.0);
}
}
was (Author: huiwenhan):
it's very good now,thanks Sean! :)
only one little issue ,can ignore line that has no recommendations ?
-2146704409350804772
[-5143306609724270245:0.0,-6887672525304767274:0.0,-7869337437647864448:0.0,1143520528292887196:0.0,4565256005884091248:0.0,-403573745216718449:0.0]
-2140684086652787668
[5066321748533664330:3.33,-6196380629601347193:2.22,1388936500341917293:2.22,-5143306609724270245:2.22,-6887672525304767274:2.22,-403573745216718449:2.22,4000074642144994975:0.0,1471545749001003492:0.0,8619821060300841906:0.0,-8796495370659715938:0.0]
-2087578807957211564 [3693944382462874249:0.0]
-2084997234534227590 []
-1994184181161252808 []
-1956807977260853620 []
-1905139778468734800 []
-1897443610249479948 []
-1861747039795463904 []
-1783644832320395644 []
-1759587438285537664 []
-1598157027497721376 []
-1524111942416072322 []
-1508995658783890206 []
-1478238285808155750 []
-1473372051895027798 []
-1360993164612489840 []
-1170376071408489552 [-8608197272004918866:0.0,-8235449048613678861:0.0]
-1106281807063652538 []
> 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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