Thanks Sebastian, I have not applied a patch before. I found the following page http://mahout.apache.org/developers/patch-check-list.html
is that description enough for applying a patch? On Sat, Apr 19, 2014 at 2:23 AM, Sebastian Schelter <[email protected]> wrote: > Mario, > > could you check whether the patch from https://issues.apache.org/ > jira/browse/MAHOUT-1517 fixes your problem? > > Best, > > Sebastian > > On 04/18/2014 11:03 PM, Mario Levitin wrote: > >> In my dataset ID's are strings so I use MemoryIDMigrator. This migrator >> produces large longs. >> I'm not doing any translation. >> >> I could not understand why there is a cast to int in the Mahout code. This >> will produce errors for large long values. >> >> >> On Fri, Apr 18, 2014 at 8:06 PM, Ted Dunning <[email protected]> >> wrote: >> >> Are you translating the ID's down into a range that will fit into int's? >>> >>> >>> >>> >>> On Thu, Apr 17, 2014 at 3:02 PM, Mario Levitin <[email protected] >>> >>>> wrote: >>>> >>> >>> Hi, >>>> >>>> I'm trying to run the ALS algorithm. However, I get the following error: >>>> >>>> Exception in thread "pool-1-thread-3" >>>> org.apache.mahout.math.IndexException: Index -691877539 is outside >>>> allowable range of [0,2147483647) >>>> at org.apache.mahout.math.AbstractVector.set(AbstractVector.java:395) >>>> at >>>> >>>> >>>> org.apache.mahout.cf.taste.impl.recommender.svd.ALSWRFactorizer. >>> sparseUserRatingVector(ALSWRFactorizer.java:305) >>> >>>> >>>> At line 305 in ALSWRFactorizer.java, there is the following code >>>> >>>> ratings.set((int) preference.getItemID(), preference.getValue()); >>>> >>>> My suspicion is that the error results from the casting to int in the >>>> >>> above >>> >>>> line. Item IDs in mahout are long, so if you cast a long (which does not >>>> fit into an int) then you will get negative numbers and hence the error. >>>> >>>> However, this explanation also seems to me implausible since I don't >>>> >>> think >>> >>>> such an error exists in Mahout code. >>>> >>>> Any help will be appreciated. >>>> Thanks >>>> >>>> >>> >> >
