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:We also assess the rate of convergence of the OFO algorithm in a pure online learning setup.3
 The online learner A in OFO was implemented in different ways, using Logistic Regression (LOGREG), the classical Perceptron algorithm (PERCEPTRON) [13] and an online linear SVM called PEGASOS [14].
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