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From yamo93 <yam...@gmail.com>
Subject Re: Illegal nDCG: NaN
Date Thu, 04 Oct 2012 16:33:58 GMT
Strange, i have ~400.000 lines in my input file (~2500 users) ...

On 10/04/2012 05:52 PM, Sean Owen wrote:
> This is something fixed in trunk, but you can ignore it. It means your eval
> is on too little data and the result is not meaningful.
>   On Oct 4, 2012 4:50 PM, "yamo93" <yamo93@gmail.com> wrote:
>
>> Hi,
>>
>> I try to evaluate a boolean data model with RecommenderIRStatsEvaluator
>> (mahout 0.7).
>>
>> I always get this exception :
>> Exception in thread "main" java.lang.**IllegalArgumentException: Illegal
>> nDCG: NaN
>>      at com.google.common.base.**Preconditions.checkArgument(**
>> Preconditions.java:92)
>>      at org.apache.mahout.cf.taste.**impl.eval.IRStatisticsImpl.<**
>> init>(IRStatisticsImpl.java:**38)
>>      at org.apache.mahout.cf.taste.**impl.eval.**
>> GenericRecommenderIRStatsEvalu**ator.evaluate(**
>> GenericRecommenderIRStatsEvalu**ator.java:212)
>>      at net.bluekiwi.bluekarma.**recommender.Evaluate.main(**
>> Evaluate.java:36)
>>
>> I saw that an issue (https://issues.apache.org/**jira/browse/MAHOUT-1015<https://issues.apache.org/jira/browse/MAHOUT-1015>)
>> was fixed in this area, is it a collateral issue ?
>>
>> Rgds,
>> Yann.
>>


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