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 respective object image and an attribute classifier; calculating a respective pairwise object-similarity measure for pairs of object images in the plurality of object images by comparing image features; and refining the first attribute score of a processing target object image based on an attribute score of an object image that is highly similar, based on the respective pairwise object-similarity measure, to the processing target object image.