Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:Going beyond a linear predictor, we used two implementations of SVMs, SVM-light [36] and Partek (Partek Software, http://www.partek.com), and examined radial, polynomial, and sigmoid kernels.
Category: