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.