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Split-PU: Hardness-aware Training Strategy for Positive-Unlabeled Learning by Xu, Chengming; Liu, Chen; Yang, Siqian; Wang, Yabiao; Zhang, Shijie; Jia, Lijie; Fu, Yanwei is a scholarly article available to read on EtoBox.

What is Split-PU: Hardness-aware Training Strategy for Positive-Unlabeled Learning about?

Positive-Unlabeled (PU) learning aims to learn a model with rare positive samples and abundant unlabeled samples. Compared with classical binary classification, the task of PU learning is much more challenging due to the existence of many incompletely-annotated data instances. Since only part of the most confident positive samples are available and evidence is not enough to categorize the rest samples, many of these unlabeled data may also be the positive samples. Research on this topic is particularly useful and essential to many real-world tasks which demand very expensive labelling cost. For example, the recognition tasks in disease diagnosis, recommendation system and satellite image recognition may only have few positive samples that can be annotated by the experts. These methods mainly omit the intrinsic hardness of some unlabeled data, which can result in sub-optimal performance as a consequence of fitting the easy noisy data and not sufficiently utilizing the hard data. In this paper, we focus on improving the commonly-used nnPU with a novel training pipeline. We highlight the intrinsic difference of hardness of samples in the dataset and the proper learning strategies for

Author

Xu, Chengming; Liu, Chen; Yang, Siqian; Wang, Yabiao; Zhang, Shijie; Jia, Lijie; Fu, Yanwei

Published

2022

Language

EN