Out-of-distribution Detection in Few-shot Classification

Sep 25, 2019 Blind Submission readers: everyone Show Bibtex
  • TL;DR: We quantitatively study out-of-distribution detection in few-shot setting, establish baseline results with ProtoNet, MAML, ABML, and improved upon them.
  • Abstract: In many real-world settings, a learning model must perform few-shot classification: learn to classify examples from unseen classes using only a few labeled examples per class. Additionally, to be safely deployed, it should have the ability to detect out-of-distribution inputs: examples that do not belong to any of the classes. While both few-shot classification and out-of-distribution detection are popular topics, their combination has not been studied. In this work, we propose tasks for out-of-distribution detection in the few-shot setting and establish benchmark datasets, based on four popular few-shot classification datasets. Then, we propose two new methods for this task and investigate their performance. In sum, we establish baseline out-of-distribution detection results using standard metrics on new benchmark datasets and show improved results with our proposed methods.
  • Keywords: few-shot classification, out-of-distribution detection, uncertainty estimate
  • Code: https://drive.google.com/open?id=1LU1B6pK19AvZeXtjSzCGAqXfuYtUA442
  • Original Pdf:  pdf
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