A Simple Baseline for Low-Budget Active Learning
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Active learning focuses on choosing a subset of unlabeled data to be labeled. However, most such methods assume that a large subset of the data can be annotated. We are interested in low-budget active learning where only a small subset (e.g., 0.2 query strategy to iteratively sample batches of unlabeled data given an initial pool, we learn rich features by an off-the-shelf self-supervised learning method only once and then study the effectiveness of different sampling strategies given a low budget on a variety of datasets as well as ImageNet dataset. We show that although the state-of-the-art active learning methods work well given a large budget of data labeling, a simple k-means clustering algorithm can outperform them on low budgets. We believe this method can be used as a simple baseline for low-budget active learning on image classification. Code is available at: https://github.com/UCDvision/low-budget-al
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