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From Sebastian Schelter <...@apache.org>
Subject Re: org.apache.mahout.math.IndexException
Date Sun, 20 Apr 2014 22:16:17 GMT
Yes, it should give you the necessary information. The important part is 
this:

Apply the patch with patch -p 0 -i <path to patch> Throw a --dry-run on 
there if you want to see what happens w/o screwing up your checkout.

On 04/20/2014 09:47 PM, Mario Levitin wrote:
> 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 <ssc@apache.org> 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 <ted.dunning@gmail.com>
>>> 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 <mariolevitin@gmail.com
>>>>
>>>>> 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
>>>>>
>>>>>
>>>>
>>>
>>
>


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