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Abdel-Rahman Hedar, Jue Wang, Masao Fukushima: Tabu search for attribute reduction in rough set theory. Soft Comput. 12(9): 909-918 (2008). 

Thanks to Adrian Pino for this contribution.

Wrapper subset evaluator

The Wrapper (weka.attributeSelection.WrapperSubsetEval) subset evaluator now supports other evaluation metrics aside from error rate (classification) and RMSE (regression). Supported metrics now include:  MAE, F-measure, AUC, RMSE  (probabilities), MAE (probabilities).Thanks to Adrian Pino for this contribution. 

Association rules

Apriori

Apriori (weka.associations.Apriori)can now make use of market basket-type data in sparse instances format. In this case, zeros (which are not stored explicitly in the sparse format) are used to represent absence of items from baskets. Previously, market basket data was encoded by using Weka's missing value indicator to indicate absence of items. Sparse data allows larger data sets to be loaded and processed by Apriori. 

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