Abstract
Univariate time-series forecasting is a kind of commonly encountered yet tough problem. Most of the forecast algorithms’ performance is constrained by the limited information due to the single input dimension. No matter how capable a forecast algorithm is, an accurate output cannot be rendered on an unpredictable time-series. This paper presents PLAE (Predictability Leveraging Auto-Encoder), a Seq2Seq model for univariate time-series data aiming to enhance the accuracy of the given algorithm without dimensional adaptation. The main idea is decomposing the original input data into a group of more predictable microscopic time-series on which the forecast algorithm can deliver a more accurate output. And the final prediction is rendered by aggregating those components back to the original one-dimension. Experiments on three public data sets and one real-world data set show that PLAE can improve the forecast accuracy for 23.38% in terms of MAPE and 19.76% in terms of RMSE. Besides, experimental evidence shows that PLAE’s adaptive non-linear decomposition mechanism outperforms the pre-defined additive decomposition w.r.t. both forecasting performance and components’ interpretability.
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Duan, J., Wang, Y., Zheng, W. (2022). PLAE: Time-Series Prediction Improvement by Adaptive Decomposition. In: Khanna, S., Cao, J., Bai, Q., Xu, G. (eds) PRICAI 2022: Trends in Artificial Intelligence. PRICAI 2022. Lecture Notes in Computer Science, vol 13629. Springer, Cham. https://doi.org/10.1007/978-3-031-20862-1_29
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