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@ad-freiburg

University of Freiburg: Algorithms and Data Structures Group

Code from our various research projects and publications

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  1. qlever Public

    Very fast SPARQL Engine, which can handle very large knowledge graphs like the complete Wikidata, offers context-sensitive autocompletion for SPARQL queries, and allows combination with text search…

    C++ 552 75

  2. aqqu Public

    More Accurate Question Answering on Freebase

    Python 107 36

  3. completesearch Public

    Search engine for semi-structured data (text and structured data) that provides all kinds of intelligent search features (keyword search, autocompletion, faceted search, error-tolerant search, syno…

    C++ 23 6

  4. pfaedle Public

    Precise map-matching for public transit feeds. Generates high-quality GTFS shapes from OSM data.

    C++ 227 31

  5. large-qa-datasets Public

    A collection of large question answering datasets

    380 38

  6. pdfact Public

    A basic tool that extracts the structure from the PDF files of scientific articles.

    Java 74 11

Repositories

Showing 10 of 65 repositories
  • qlever Public

    Very fast SPARQL Engine, which can handle very large knowledge graphs like the complete Wikidata, offers context-sensitive autocompletion for SPARQL queries, and allows combination with text search. It's faster than engines like Blazegraph or Virtuoso, especially for queries involving large result sets.

    C++ 552 Apache-2.0 75 99 62 Updated Apr 26, 2025
  • qlever-control Public
    Python 41 Apache-2.0 20 34 17 Updated Apr 26, 2025
  • sparql-conformance Public

    SPARQL test suite (https://www.w3.org/2009/sparql/docs/tests/) for QLEVER (https://github.com/ad-freiburg/qlever)

    Python 1 2 4 0 Updated Apr 25, 2025
  • osm-live-updates Public

    Update SPARQL endpoints with OpenStreetMap data (converted via osm2rdf) by processing OsmChange files

    C++ 0 GPL-3.0 1 0 0 Updated Apr 25, 2025
  • qlever-ui Public

    A user interface for QLever

    JavaScript 34 Apache-2.0 17 37 (1 issue needs help) 6 Updated Apr 23, 2025
  • ad-blog Public

    AD Blog Posts (currently: student project reports)

    HTML 0 37 1 4 Updated Apr 17, 2025
  • qlever-petrimaps Public
    C++ 14 3 4 2 Updated Apr 17, 2025
  • osm2rdf Public

    Convert OpenStreetMap (OSM) data to RDF Turtle, including the object geometries and predicates ogc:sfContains, ogc:sfCovers, ogc:sfIntersects, ogc:sfTouches, ogc:sfCrosses, ogc:sfEquals, and ogc:sfOverlaps. Weekly updated downloads for the whole planet (~ 80 billion triples) and per country.

    C++ 25 GPL-3.0 8 11 6 Updated Apr 16, 2025
  • wiki-entity-linker Public
    JavaScript 2 Apache-2.0 0 0 0 Updated Apr 14, 2025
  • elevant Public

    Entity linking evaluation and analysis tool

    Python 22 Apache-2.0 1 1 0 Updated Apr 14, 2025
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