ELKI 0.7.1 release notes

ELKI 0.7.1 is available on Maven:

<!-- ELKI core, without visualization -->
<dependency>
    <groupId>de.lmu.ifi.dbs.elki</groupId>
    <artifactId>elki</artifactId>
    <version>0.7.1</version>
</dependency>
<!-- You only need this dependency if you need visualization -->
<dependency>
    <groupId>de.lmu.ifi.dbs.elki</groupId>
    <artifactId>elki-batik-visualization</artifactId>
    <version>0.7.1</version>
</dependency>

Please clone https://github.com/elki-project/example-elki-project for a minimal project example.

Algorithm additions:

• GriDBSCAN: DBSCAN using grid partitioning (Minkowski distances only)
• Compare-Means and Sort-Means k-means variations (much faster than traditional k-means)
• Visualization of dendrograms.

Important bug fixes:

• Classes with no package (“default package”) would cause errors.
• The fast power function implementation was sometimes returning incorrect results.
• Random sampling was sometimes not sampling from the full data set.

UI improvements:

• The file input source will now automatically choose the Arff parser for .arff files.
• MiniGUI now allows choosing other applications.
• MiniGUI now displays the command line in a separate field.
• MiniGUI displays an error message, if an incorrect classpath or JAyatana (on Ubuntu) is detected.
• Export to png now works, we added a work-around for an open Batik bug.

To enable PDF and PostScript export, you need to add Apache FOP with all dependencies.

(Nevertheless, we recommend using SVG and Inkscape).

Smaller changes:

• Many smaller bug fixes.
• C-Index for cluster evaluation now can process larger data sets.
• OPTICS output of undefined reachability fixed.
• External distance matrixes are easier to use and perform additional checks.
• Precomputed distance matrixes can answer range and kNN queries.
• Voronoi visualization can be switched in the menu now.
• Improved backwards command line compatibility with additional aliases.
• Added generated @since annotations in JavaDoc.
• Many new unit tests, renamed to the Java conventions.
• Low-level reading of service files, to have faster startup.

See also release notes 0.7 for additional release notes of ELKI 0.7.0