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arXiv 2407.17880cs.LG
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DAM:迈向时间序列预测的基础模型

DAM: Towards A Foundation Model for Time Series Forecasting

School of Computer Science, University of St Andrews(圣安德鲁斯大学计算机学院);Systems Infrastructure Research(系统基础设施研究机构);Edinburgh Research Centre(爱丁堡研究中心);Central Software Institute(中央软件研究院);Huawei(华为)

Luke Darlow, Qiwen Deng, Ahmed Hassan, Martin Asenov, Rajkarn Singh, Artjom Joosen, Adam Barker, Amos Storkey

AI总结:

提出DAM神经网络模型,通过随机采样历史数据并输出可调基函数组合作为时间连续函数,实现非固定预测期的通用时间序列预测,在零样本迁移和长期预测等任务上表现优异。

摘要:

扩展时间序列预测模型是一项具有挑战性的任务,需要使其能够在多个不同领域和数据集上进行准确预测,而这些领域和数据集可能具有完全不同的底层收集程序(例如采样分辨率)、模式(例如周期性)和预测要求(例如重构与预测)。我们将这一通用任务称为通用预测。现有方法通常假设输入数据是规则采样的,并且它们在预先确定的预测期上进行预测,导致无法在训练范围之外进行泛化。我们提出了DAM——一种神经网络模型,它接收随机采样的历史数据,并输出可调整的基函数组合,作为时间的连续函数,用于非固定预测期的预测。它包含三个关键组件:(1)一种灵活的方法,用于从长尾分布中利用随机采样的历史数据,这能够实现对底层时间动态的高效全局视角,同时保留对近期历史的关注;(2)一个在这些主动采样的历史数据上训练的transformer骨干网络,以产生作为表示输出的(3)时间连续函数的基函数系数。我们展示了在25个时间序列数据集上训练的单变量DAM,在18个数据集上的多变量长期预测中,其表现优于或接近现有的SoTA模型,其中包括8个用于零样本迁移的留出数据集,即使这些模型是专门针对每个数据集-预测期组合进行训练的。这个单一的DAM在零样本迁移和超长期预测方面表现出色,在插补任务上也表现良好,可通过基函数组合和注意力机制进行解释,可针对不同的推理成本要求进行调整,并且在设计上对缺失和不规则采样的数据具有鲁棒性。

英文摘要:

It is challenging to scale time series forecasting models such that they forecast accurately for multiple distinct domains and datasets, all with potentially different underlying collection procedures (e.g., sample resolution), patterns (e.g., periodicity), and prediction requirements (e.g., reconstruction vs. forecasting). We call this general task universal forecasting. Existing methods usually assume that input data is regularly sampled, and they forecast to pre-determined horizons, resulting in failure to generalise outside of the scope of their training. We propose the DAM - a neural model that takes randomly sampled histories and outputs an adjustable basis composition as a continuous function of time for forecasting to non-fixed horizons. It involves three key components: (1) a flexible approach for using randomly sampled histories from a long-tail distribution, that enables an efficient global perspective of the underlying temporal dynamics while retaining focus on the recent history; (2) a transformer backbone that is trained on these actively sampled histories to produce, as representational output, (3) the basis coefficients of a continuous function of time. We show that a single univariate DAM, trained on 25 time series datasets, either outperformed or closely matched existing SoTA models at multivariate long-term forecasting across 18 datasets, including 8 held-out for zero-shot transfer, even though these models were trained to specialise for each dataset-horizon combination. This single DAM excels at zero-shot transfer and very-long-term forecasting, performs well at imputation, is interpretable via basis function composition and attention, can be tuned for different inference-cost requirements, is robust to missing and irregularly sampled data {by design}.

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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