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Core Weka

  • Weka 3.7 is now GPL 3.0.
  • Weka releases now available on Maven central
  • Logistic now has an option to use conjugate gradient descent rather than quasi-Newton with BFGS updates.
  • weka.classifiers.bayes.NaiveBayesMultinomialText - naive Bayes multinomial classifier that operates directly on string attributes.
  • Appender component for the Knowledge Flow that can append sets of instances together.
  • SubstringLabeler component for the Knowledge Flow that can use substring or regex matching on string attribute values to assign various user defined nominal values to a new "label" attribute.
  • SubstringReplacer component for the Knowledge Flow that can replace substrings or regex matches with user supplied strings in string attribute values.
  • Sorter component for the Knowledge Flow that implements a streaming merge sort that writes a sorted in-memory buffer to a file when full. Can sort descending or ascending on multiple attributes.
  • DatabaseSaver can now truncate the target table if desired.
  • Area under the precision-recall curve evaluation metric.
  • Package manager's cache refresh mechanism is now much faster.
  • Package manager now checks for new versions of existing packages on the server as well as entirely new packages.
  • Random forest now has an option to print all the ensemble trees as part of its output.

In Packages

  • weka.clusterers.CascadeSimpleKMeans, contributed by Martin Guetlein.
  • weka.classifiers.functions.RBFRegressor added to the RBFNetwork package
  • jsonFieldExtractor package - Knowledge Flow step to extract one or more fields from repeating blocks of JSON text into new attributes.

This documentation is maintained by the Pentaho community, and members are encouraged to create new pages in the appropriate spaces, or edit existing pages that need to be corrected or updated.

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