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:Specifically, the autonomous vehicle segmentation dataset KITTI (Ros et al. 2015) is used, augmented with 49 additional train images by (Kundu et al. 2014), leading to 149 train and 46 test images, and the CamVid dataset (Brostow, Fauqueur, and Cipolla 2009), split into 525 train and 175 test…
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