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Posted to dev@mahout.apache.org by "Sebastian Schelter (JIRA)" <ji...@apache.org> on 2010/04/07 13:27:33 UTC
[jira] Created: (MAHOUT-367) IllegalArgumentException in
AbstractJDBCModel when requesting mostSimilarItems for an item without
preferences
IllegalArgumentException in AbstractJDBCModel when requesting mostSimilarItems for an item without preferences
--------------------------------------------------------------------------------------------------------------
Key: MAHOUT-367
URL: https://issues.apache.org/jira/browse/MAHOUT-367
Project: Mahout
Issue Type: Bug
Components: Collaborative Filtering
Reporter: Sebastian Schelter
I'm using GenericItemBasedRecommender together with MySQLJDBCDataModel for generating recommendations for an online shop. Whenever the recommender tries to calculate the most similar items for an item without preferences (e.g. a brand new product), an IllegalArgumentException is thrown as AbstractJDBCModel tries to create a GenericItemPreferenceArray from the empty preference list.
Sample stacktrace:
java.lang.IllegalArgumentException: size is less than 1
at org.apache.mahout.cf.taste.impl.model.GenericItemPreferenceArray.<init>(GenericItemPreferenceArray.java:49)
at org.apache.mahout.cf.taste.impl.model.GenericItemPreferenceArray.<init>(GenericItemPreferenceArray.java:56)
at org.apache.mahout.cf.taste.impl.model.jdbc.AbstractJDBCDataModel.getPreferencesForItem(AbstractJDBCDataModel.java:441)
at org.apache.mahout.cf.taste.impl.recommender.GenericItemBasedRecommender.doMostSimilarItems(GenericItemBasedRecommender.java:169)
at org.apache.mahout.cf.taste.impl.recommender.GenericItemBasedRecommender.mostSimilarItems(GenericItemBasedRecommender.java:128)
at org.apache.mahout.cf.taste.impl.recommender.GenericItemBasedRecommender.mostSimilarItems(GenericItemBasedRecommender.java:121)
at de.zalando.recommendation.recommender.cf.TasteRecommenderAdapter.mostSimilarItems(TasteRecommenderAdapter.java:38)
at de.zalando.recommendation.recommender.taste.cache.CachingRecommender.mostSimilarItems(CachingRecommender.java:39)
at de.zalando.recommendation.recoreco.rest.RecommendationsRestController.mostSimilarItems(RecommendationsRestController.java:53)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.doInvokeMethod(HandlerMethodInvoker.java:710)
at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:167)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:414)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:402)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:771)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:716)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:647)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:552)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:619)
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[jira] Resolved: (MAHOUT-367) IllegalArgumentException in
AbstractJDBCModel when requesting mostSimilarItems for an item without
preferences
Posted by "Sean Owen (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAHOUT-367?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sean Owen resolved MAHOUT-367.
------------------------------
Resolution: Fixed
Fix Version/s: 0.4
Assignee: Sean Owen
Easy enough, I committed what I think is the right solution.
> IllegalArgumentException in AbstractJDBCModel when requesting mostSimilarItems for an item without preferences
> --------------------------------------------------------------------------------------------------------------
>
> Key: MAHOUT-367
> URL: https://issues.apache.org/jira/browse/MAHOUT-367
> Project: Mahout
> Issue Type: Bug
> Components: Collaborative Filtering
> Reporter: Sebastian Schelter
> Assignee: Sean Owen
> Fix For: 0.4
>
>
> I'm using GenericItemBasedRecommender together with MySQLJDBCDataModel for generating recommendations for an online shop. Whenever the recommender tries to calculate the most similar items for an item without preferences (e.g. a brand new product), an IllegalArgumentException is thrown as AbstractJDBCModel tries to create a GenericItemPreferenceArray from the empty preference list.
> Sample stacktrace:
> java.lang.IllegalArgumentException: size is less than 1
> at org.apache.mahout.cf.taste.impl.model.GenericItemPreferenceArray.<init>(GenericItemPreferenceArray.java:49)
> at org.apache.mahout.cf.taste.impl.model.GenericItemPreferenceArray.<init>(GenericItemPreferenceArray.java:56)
> at org.apache.mahout.cf.taste.impl.model.jdbc.AbstractJDBCDataModel.getPreferencesForItem(AbstractJDBCDataModel.java:441)
> at org.apache.mahout.cf.taste.impl.recommender.GenericItemBasedRecommender.doMostSimilarItems(GenericItemBasedRecommender.java:169)
> at org.apache.mahout.cf.taste.impl.recommender.GenericItemBasedRecommender.mostSimilarItems(GenericItemBasedRecommender.java:128)
> at org.apache.mahout.cf.taste.impl.recommender.GenericItemBasedRecommender.mostSimilarItems(GenericItemBasedRecommender.java:121)
> at de.zalando.recommendation.recommender.cf.TasteRecommenderAdapter.mostSimilarItems(TasteRecommenderAdapter.java:38)
> at de.zalando.recommendation.recommender.taste.cache.CachingRecommender.mostSimilarItems(CachingRecommender.java:39)
> at de.zalando.recommendation.recoreco.rest.RecommendationsRestController.mostSimilarItems(RecommendationsRestController.java:53)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.doInvokeMethod(HandlerMethodInvoker.java:710)
> at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:167)
> at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:414)
> at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:402)
> at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:771)
> at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:716)
> at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:647)
> at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:552)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
> at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
> at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
> at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
> at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
> at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
> at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
> at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
> at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
> at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
> at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
> at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
> at java.lang.Thread.run(Thread.java:619)
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