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Originality A major contribution of the paper is posing image set summarization as a submodular optimization problem; to the knowledge of this reviewer, this is a novel view of the problem. Together with a new dataset and the adaptation of ROUGE to a significantly different application domain, this paper has several novel contributions to the state of the art. Significance According to this reviewer, this work fits well in the topics of interest for NIPS, to which it makes a significant contribution. Q2: Please summarize your review in 1-2 sentences The paper presents an elegant formulation of the problem of image collection summarization along with a new dataset and an evaluation metric.