Meta-learning framework with applications to zero-shot time-series forecasting
Abstract
Can meta-learning discover generic ways of processing time series (TS) from a diverse dataset so as to greatly improve generalization on new TS coming from different datasets? This work provides positive evidence to this using a broad meta-learning framework which we show subsumes many existing meta-learning algorithms. Our theoretical analysis suggests that residual connections act as a meta-learning adaptation mechanism, generating a subset of task-specific parameters based on a given TS input, thus gradually expanding the expressive power of the architecture on-the-fly. The same mechanism is shown via linearization analysis to have the interpretation of a sequential update of the final linear layer. Our empirical results on a wide range of data emphasize the importance of the identified meta-learning mechanisms for successful zero-shot univariate forecasting, suggesting that it is viable to train a neural network on a source TS dataset and deploy it on a different target TS dataset without retraining, resulting in performance that is at least as good as that of state-of-practice univariate forecasting models.
Cite
@article{arxiv.2002.02887,
title = {Meta-learning framework with applications to zero-shot time-series forecasting},
author = {Boris N. Oreshkin and Dmitri Carpov and Nicolas Chapados and Yoshua Bengio},
journal= {arXiv preprint arXiv:2002.02887},
year = {2020}
}