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arXiv 2008.07730cs.LGstat.ML
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多变量时间序列预测长期趋势和短期波动框架的并行提取

Parallel Extraction of Long-term Trends and Short-term Fluctuation Framework for Multivariate Time Series Forecasting

The University of Queensland(昆士兰大学);Zhejiang University(浙江大学);Chongqing University(重庆大学);Purdue University(普渡大学)

Yifu Zhou, Ziheng Duan, Haoyan Xu, Jie Feng, Anni Ren, Yueyang Wang, Xiaoqian Wang

摘要:

多元时间序列预测在各个领域有着广泛的应用。合理的预测结果可以辅助人们进行规划和决策,产生效益,规避风险。通常,时间序列有两个特征,即长期趋势和短期波动。例如,股票价格会随着市场出现长期上涨趋势,但短期内可能会出现小幅下跌。这两个特征往往是相对独立的。然而,现有的预测方法往往不区分它们,这降低了预测模型的准确性。本文提出了一个MTS预测框架,它可以并行地捕捉时间序列的长期趋势和短期波动。该方法使用原始时间序列及其一阶差分来表征长期趋势和短期波动。构造了三个预测子网络,分别用于预测长期趋势、短期波动和最终预测值。在总体优化目标上,借鉴了多任务学习的思想,即在要求逼近待预测值的同时,使长期趋势和短期波动的预测结果尽可能接近真实值。该方法利用了更多的监督信息,能够更准确地捕捉时间序列的变化趋势,从而提高了预测性能。

英文摘要:

Multivariate time series forecasting is widely used in various fields. Reasonable prediction results can assist people in planning and decision-making, generate benefits and avoid risks. Normally, there are two characteristics of time series, that is, long-term trend and short-term fluctuation. For example, stock prices will have a long-term upward trend with the market, but there may be a small decline in the short term. These two characteristics are often relatively independent of each other. However, the existing prediction methods often do not distinguish between them, which reduces the accuracy of the prediction model. In this paper, a MTS forecasting framework that can capture the long-term trends and short-term fluctuations of time series in parallel is proposed. This method uses the original time series and its first difference to characterize long-term trends and short-term fluctuations. Three prediction sub-networks are constructed to predict long-term trends, short-term fluctuations and the final value to be predicted. In the overall optimization goal, the idea of multi-task learning is used for reference, which is to make the prediction results of long-term trends and short-term fluctuations as close to the real values as possible while requiring to approximate the values to be predicted. In this way, the proposed method uses more supervision information and can more accurately capture the changing trend of the time series, thereby improving the forecasting 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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