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Lei Zan

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#machine learning Preprint Sep 2026

Instance-Adaptive Prompts as Context for Time-Series Foundation Models

PaCTS is introduced, which generates a small set of instance-adaptive latent prompts in the form of continuous embedding tokens conditioned on the visible context, which serve as compact context surrogates for frozen TSFMs.

Ze-Hao Xiao, Shi-Feng Xie, Lei Zan et al. · 0 citations

Post-Training in Time Series Foundation Models: A Unifying Framework

This work analyzes TSFM post-training methods based on their locus of intervention in the prediction pipeline, yielding five categories: parameter adaptation, context augmentation, model composition, output processing and uncertainty control, and compression and specialization.

Shi-Feng Xie, Ambroise Odonnat, Ze-Hao Xiao et al. · 3 citations
#machine learning Preprint Sep 2026

Tabby: An Open Pretraining Recipe for Time Series Foundation Models

Tabby, a long context probabilistic time series foundation model, is released together with a complete and open recipe of how it was built, which achieves competitive zero-shot forecasting performance on GIFT-Eval and the out-of-distribution TIME benchmark.

Shi-Feng Xie, Bahaeddine Abdessalem, Ze-Hao Xiao et al. · 1 citation
#artificial intelligence Preprint Sep 2026

Beyond Stationarity in Time Series: Discovering Causal Structures and Latent Regimes via Markov Blankets

Empirical results show that RCBNB-MB systematically outperforms baseline approaches in accurately detecting regime changes and their associated causal graphs, positioning it as a robust and versatile framework for non-stationary time series analysis.

Lei Zan, C. Assaad, Emilie Devijver et al. · 0 citations

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