[mlpack] Numeric sensitivity of RangeSearch
Li Dong
dongli at lasg.iap.ac.cn
Tue Mar 25 10:34:12 EDT 2014
Hi Ryan,
Thanks for your quick fixing! It looks correct now. The tutorial is the key resources for our users~ It would be better if you could give some explanation for this change on the tutorial.
Best,
Li
On Mar 25, 2014, at 10:06 PM, Ryan Curtin <gth671b at mail.gatech.edu> wrote:
> On Tue, Mar 25, 2014 at 09:55:17PM +0800, Li Dong wrote:
>> Dear Ryan,
>>
>> I have isolated a bug case into a single code in the attachment, from which you can see the results:
>>
>> Neighbor grid number is 201 when R is 1.
>> Neighbor grid number is 102 when R is 6.371e+06.
>
> Hi Li,
>
> Thank you for the easy code sample. In the code you have written:
>
> typedef mlpack::tree::BinarySpaceTree<
> mlpack::bound::HRectBound<2>,
> mlpack::range::RangeSearchStat> TreeType;
> typedef mlpack::metric::SquaredEuclideanDistance MetricType;
> typedef mlpack::range::RangeSearch<MetricType, TreeType> Searcher;
>
> If you change SquaredEuclideanDistance to EuclideanDistance, the problem
> is solved. I noticed that the tutorial [1] suggests using the
> SquaredEuclideanDistance class, but this is no longer correct based on
> the pruning rules that the RangeSearch class uses.
>
> I have fixed the tutorials in r16378 and r16379 and am in the process of
> rebuilding them for the website. I am sorry for the errors in the
> tutorials.
>
> Thanks,
>
> Ryan
>
> --
> Ryan Curtin | "I am."
> ryan at ratml.org | - Joe
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