On Mon, Jun 17, 2013 at 11:44 PM, Mathieu Blondel <[email protected]>wrote:
>
>
> On Mon, Jun 17, 2013 at 10:27 PM, Lars Buitinck <[email protected]>wrote:
>
>> In pairwise L2R, loss functions are defined on pairs of samples, but
>> only for those pairs that pertain to the same query (since ranking is
>> done per query). So, you need the query information with the samples.
>>
>
> Actually, if I am not mistaken, the query grouping is not a requirement
> but just an heuristic to speed up training.
> Technically, samples that do not belong to the same query should be ranked
> lower than those
> that do.
>
Truer for IR, than, say parse reranking, where a parse that is valid for a
6-word sentence is simply invalid for a 7-word sentence... But that's
certainly beside the point.
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