1. A method for refining attribute scores, the method comprising: obtaining a plurality of object images; generating a respective first attribute score of a first attribute for each object image in the plurality of object images based on the object images; calculating a respective pairwise object-similarity measure for pairs of object images in the plurality of object images; and refining the first attribute score of an object image in the plurality of object images based at least in part on the attribute scores of other object images in the plurality of object images and on the object-similarity measures of the pairs of object images in the plurality of object images.