Weka. Weka A Java-based machine vlearning tool Implements numerous classifiers and other ML algorithms Uses a common.

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Presentation transcript:

Weka

Weka A Java-based machine vlearning tool Implements numerous classifiers and other ML algorithms Uses a common data representation format, making comparisons easy Comprehensive set of data pre-processing tools and evaluation methods 3 modes of operation: GUI, Command Line, Java API 2

@relation age sex { female, chest_pain_type { typ_angina, asympt, non_anginal, cholesterol exercise_induced_angina { no, class { present, 63,male,typ_angina,233,no,not_present 67,male,asympt,286,yes,present 67,male,asympt,229,yes,present 38,female,non_anginal,?,no,not_present....arff data format

Using SVM in Weka SMO is the implementation of SVM used in Weka Note that all nominal attributes are converted into sets of binary attributes You can choose either the RBF kernel or the polynomial kernel In either case, you have the linear versus non-linear options

Weka demo 5

Weka vs. svm_light vs. … Weka is good for experimenting with different ML algorithms Other, more specific tools are much more efficient and scalable For SVMs, for example, many use svm_light Works well for 10K+ features, 100K+ training vectors Uses a sparse vector representation –Good for many features (e.g., text) 6