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• W3207208720 abstract "Few-shot classification aims to generalize basic knowledge to recognize novel categories from a few samples. Recent centroid-based methods achieve promising classification performance with the nearest neighbor rule. However, we consider that those methods intrinsically ignore per-class distribution, as the decision boundaries are biased due to the diversity of intra-class variances. Hence, we propose a class-wise metric scaling (CMS) mechanism, which can be applied to both training and testing stages. Concretely, metric scalars are set as learnable parameters in the training stage, helping to learn a more discriminative and transferable feature representation. As for testing, we construct a convex optimization problem to generate an optimal scalar vector for refining the nearest neighbor decisions. Besides, we also involve a low-ranking bilinear pooling layer for improved representation capacity, which further provides significant performance gains. Extensive experiments are conducted on a series of feature extractor backbones, datasets, and testing modes, which have shown consistent improvements compared to prior SOTA methods, e.g., we achieve accuracies of 66.64 % and 83.63 % for 5-way 1-shot and 5-shot settings on the mini-ImageNet, respectively. Under the semi-supervised inductive mode, results are further up to 78.34 % and 87.53 %, respectively." @default.
• W3207208720 created "2021-10-25" @default.
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• W3207208720 date "2021-01-01" @default.
• W3207208720 modified "2023-09-29" @default.
• W3207208720 title "Class-wise Metric Scaling for Improved Few-Shot Classification" @default.
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• W3207208720 doi "https://doi.org/10.1109/wacv48630.2021.00063" @default.
• W3207208720 hasPublicationYear "2021" @default.
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