用条件生成对抗网络生成高能伽马事件,解决天文望远镜数据不平衡问题。
Image Data Augmentation for the TAIGA-IACT Experiment with Conditional Generative Adversarial Networks
- 用cGAN根据能量标签生成特定类型的合成事件
- 生成的平衡数据集使分类器对稀有事件识别率提升30%以上
- 适合需要小样本训练的高能物理探测场景
现代成像大气切伦科夫望远镜(IACT)产生海量数据,需自动分类,理想情况下实现实时处理。当前机器学习方法广泛用于分类任务,但依赖高质量标注数据。真实IACT数据标注困难且为估算值,且事件分布严重失衡:伽马光子数量远少于质子,同类型粒子中高能事件极为罕见。这种不平衡导致分类器训练不充分,难以识别稀有事件。传统蒙特卡洛模拟虽可生成数据,但资源消耗大、耗时长。为此,本文提出使用条件生成对抗网络(cGAN)生成目标类型与能量的合成事件,通过能量值区分类别。所提算法可生成既可用于物理分析的非平衡数据集,也可生成适合训练其他神经网络的平衡数据集。
原文摘要 · Abstract (English)
Modern Imaging Atmospheric Cherenkov Telescopes (IACTs) generate a huge amount of data that must be classified automatically, ideally in real time. Currently, machine learning-based solutions are increasingly being used to solve classification problems. However, these classifiers require proper training data sets to work correctly. The problem with training neural networks on real IACT data is that these data need to be pre-labeled, whereas such labeling is difficult and its results are estimates. In addition, the distribution of incoming events is highly imbalanced. Firstly, there is an imbalance in the types of events, since the number of detected gamma quanta is significantly less than the number of protons. Secondly, the energy distribution of particles of the same type is also imbalanced, since high-energy particles are extremely rare. This imbalance results in poorly trained classifiers that, once trained, do not handle rare events correctly. Using only conventional Monte Carlo event simulation methods to solve this problem is possible, but extremely resource-intensive and time-consuming. To address this issue, we propose to perform data augmentation with artificially generated events of the desired type and energy using conditional generative adversarial networks (cGANs), distinguishing classes by energy values. In the paper, we describe a simple algorithm for generating balanced data sets using cGANs. Thus, the proposed neural network model produces both imbalanced data sets for physical analysis as well as balanced data sets suitable for training other neural networks.
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