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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++ 530 69

  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++ 20 5

  4. pfaedle Public

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

    C++ 222 31

  5. large-qa-datasets Public

    A collection of large question answering datasets

    371 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 64 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++ 530 Apache-2.0 69 117 48 Updated Mar 28, 2025
  • spatialjoin Public

    Compute spatial self-joins (on intersects, contains, covers, touches, crosses, overlaps, equals) on large collections of WKT geometries. Can handle the complete OSM data as input.

    C++ 3 0 0 2 Updated Mar 28, 2025
  • util Public

    Small library of utility functions

    C++ 0 0 0 0 Updated Mar 28, 2025
  • natural-entity-types Public

    Methods for determining the most natural type of a Wikidata entity

    Python 1 0 0 0 Updated Mar 28, 2025
  • JavaScript 2 Apache-2.0 0 0 0 Updated Mar 28, 2025
  • elevant Public

    Entity linking evaluation and analysis tool

    Python 21 Apache-2.0 1 1 0 Updated Mar 28, 2025
  • ad-blog Public

    AD Blog Posts (currently: student project reports)

    HTML 0 36 1 4 Updated Mar 28, 2025
  • Python 40 Apache-2.0 19 30 16 Updated Mar 27, 2025
  • qlever-ui Public

    A user interface for QLever

    JavaScript 32 Apache-2.0 18 36 (1 issue needs help) 8 Updated Mar 24, 2025
  • C++ 11 3 5 3 Updated Mar 19, 2025