Thanks, Jona. So I guess we can go ahead and create some table mappings?
Cheers,
Pablo
On Tue, Mar 13, 2012 at 1:17 AM, Jona Christopher Sahnwaldt <[email protected]
> wrote:
> > I would love to see extractor.TableMappings fixed, and more table
> mappings
> > created. Jona has already stopped the likely infinite loop in that
> class. I
> > quickly scanned through the code and had the impression that it lacks a
> > termination criterion for its recursion. Shouldn't be too hard to fix if
> you
> > have a couple of hours to throw at it.
> Unless there was a cycle in the class relations (which might even
> make sense with equivalent classes), the recursion did terminate.
> The problem was that the triple list was appended to itself
> (and thus doubled in size) each time the method writeType was
> called and in the end grew by a factor of 2^(r*c) (or thereabouts),
> where r is the number of resources extracted from one table
> and c is the average number of all related classes (transitive base
> and equivalent classes) of each of these resources. For
> pages like http://en.wikipedia.org/wiki/Ford_Crown_Victoria (see [1])
> or http://en.wikipedia.org/wiki/Airbus_A300 (see [2]) the table
> extractor generates around 20 variants with around 3 related classes for
> each. 2^60 is a big number. :-) A server with a few
> exabytes RAM might have handled that, but remember
> that we then try to send that page to a poor browser. :-)
>
> The thing is that there already is correct code for adding all
> types for a resource to a triple set. We also do that in
> TemplateMapping:
>
>
> http://dbpedia.hg.sourceforge.net/hgweb/dbpedia/extraction_framework/file/3180c9d769fa/core/src/main/scala/org/dbpedia/extraction/mappings/TemplateMapping.scala#l83
>
> I'd like to move that code to OntologyClass, but I'd also like
> to think about improving it. I think the code in TemplateMapping still
> blows up if there are cycles in class relations. And there may be other
> places where we re-implemented this process.
>
> Cheers,
> JC
>
> [1]
> http://mappings.dbpedia.org/server/mappings/en/extractionSamples/Mapping:Infobox_Automobile_generation
> [2]
> http://mappings.dbpedia.org/server/mappings/en/extractionSamples/Mapping:Infobox_aircraft_type
>
> On Mon, Mar 12, 2012 at 23:24, Pablo Mendes <[email protected]> wrote:
> >
> > Hi emijrp,
> > If by "underdeveloped" you mean where does DBpedia need more data, then
> you
> > should take a look at the mappings statistics for the language of your
> > interest:
> > http://mappings.dbpedia.org/index.php/Mapping_Statistics
> >
> > If by "underdeveloped" you mean where does DBpedia needs some coding,
> then I
> > would say TableMappings. Some tables on Wikipedia seem that they would
> > easily produce good data:
> > http://en.wikipedia.org/wiki/List_of_social_networking_websites
> >
> > While others would be harder (e.g. multiple links within a cell):
> > http://en.wikipedia.org/wiki/List_of_sovereign_states
> >
> > But it would be great if it caught at least the easy cases. This would
> > enable the extraction of about 73.6% [1] of the list pages on Wikipedia.
> >
> > I would love to see extractor.TableMappings fixed, and more table
> mappings
> > created. Jona has already stopped the likely infinite loop in that
> class. I
> > quickly scanned through the code and had the impression that it lacks a
> > termination criterion for its recursion. Shouldn't be too hard to fix if
> you
> > have a couple of hours to throw at it.
> >
> > Cheers,
> > Pablo
> >
> > [1]
> http://articles.businessinsider.com/2010-02-17/strategy/30008803_1_market-forecasts-analysis-data-projections
> >
> > On Mon, Mar 12, 2012 at 10:50 PM, emijrp <[email protected]> wrote:
> >>
> >> Cool, thanks!
> >>
> >> What are the under-developed areas in dbpedia?
> >>
> >> 2012/3/12 Jona Christopher Sahnwaldt <[email protected]>
> >>>
> >>> Hi emijrp, Anja gave you editor rights on Feb 8.
> >>> Maybe you already know, but there was no
> >>> reply to your mail on the list. Regards, JC
> >>>
> >>>
> >>> On Wed, Feb 8, 2012 at 22:58, emijrp <[email protected]> wrote:
> >>> > Hi. My account "emijrp" on the mappings wiki has not been activated
> >>> > yet,
> >>> > after some weeks waiting. Regards.
> >>
> >>
> >>
> >>
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