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From Matthias Böhmer <matth...@m-boehmer.de>
Subject Re: Data Types for Item/Element Ids
Date Fri, 09 Jul 2010 10:12:58 GMT
Very good question! Could you please point me to the support of the
library where I can find a mapper form strings to longs for item and
unser IDs? Thank you!

Matthias


2010/7/9 Sean Owen <srowen@gmail.com>:
> I believe you are referring to recommenders specifically. It used to
> allow string IDs but it's a lot of overhead. Most applications already
> use integer identifiers for these entities -- and those that don't can
> use the support in the library for building a mapping from strings to
> ints.
>
> Vectors naturally have integer dimensions of course, but can in some
> cases label the dimensions with strings.
>
> The answer depends on what you are referring to but think it's going
> to be integers for the most part, since the caller can map anything to
> integers without much trouble.
>
> On Fri, Jul 9, 2010 at 11:04 AM, Kris Jack <mrkrisjack@gmail.com> wrote:
>> Hi everyone,
>>
>> In mahout, I get the impression that most of the data structures require
>> item/element ids to be longs or ints.  As Mahout is designed to scale up to
>> huge data sets, would it be useful to also allow strings as ids, such as
>> universally unique identifiers?  Any comments?
>>
>> Regards,
>> Kris
>>
>



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