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arXiv 2602.17868cs.LGcs.AI
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MantisV2: 通过合成数据和测试时策略缩小零样本时间序列分类的差距

MantisV2: Closing the Zero-Shot Gap in Time Series Classification with Synthetic Data and Test-Time Strategies

Vasilii Feofanov, Songkang Wen, Jianfeng Zhang, Lujia Pan, Ievgen Redko

AI总结:

MantisV2通过合成数据和测试时策略提升时间序列分类的零样本性能

摘要:

开发时间序列分类的基础模型具有很高的实际相关性,因为这些模型可以作为通用的特征提取器用于各种下游任务。尽管早期模型如Mantis展示了这种方法的潜力,但冻结和微调编码器之间仍存在显著的性能差距。在本工作中,我们引入了显著增强零样本特征提取的方法。首先,我们介绍了完全在合成时间序列上预训练的Mantis+变种。其次,通过受控的消融研究,我们优化了架构并获得MantisV2,一种改进且更轻量的编码器。第三,我们提出了一种增强的测试时方法,利用中间层表示并优化输出令牌聚合。此外,我们展示了通过自增强和跨模型嵌入融合可以进一步提高性能。在UCR、UEA、人体活动识别(HAR)基准和EEG数据集上的广泛实验表明,MantisV2和Mantis+一致优于先前的时间序列基础模型,实现了最先进的零样本性能。

英文摘要:

Developing foundation models for time series classification is of high practical relevance, as such models can serve as universal feature extractors for diverse downstream tasks. Although early models such as Mantis have shown the promise of this approach, a substantial performance gap remained between frozen and fine-tuned encoders. In this work, we introduce methods that significantly strengthen zero-shot feature extraction for time series. First, we introduce Mantis+, a variant of Mantis pre-trained entirely on synthetic time series. Second, through controlled ablation studies, we refine the architecture and obtain MantisV2, an improved and more lightweight encoder. Third, we propose an enhanced test-time methodology that leverages intermediate-layer representations and refines output-token aggregation. In addition, we show that performance can be further improved via self-ensembling and cross-model embedding fusion. Extensive experiments on UCR, UEA, Human Activity Recognition (HAR) benchmarks, and EEG datasets show that MantisV2 and Mantis+ consistently outperform prior time series foundation models, achieving state-of-the-art zero-shot performance.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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