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Unified Zero-Shot Time Series Forecasting: A Darts Foundation

Summary

Darts, a popular open-source time series library, introduces a unified interface for foundation models, enabling zero-shot forecasting, fine-tuning, and backtesting with minimal code changes.

SourcearXiv Machine LearningAuthor: Zhihao Dai, Dennis Bader, Alain Gysi
Unified Zero-Shot Time Series Forecasting: A Darts Foundation
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[2606.27438] Unified Zero-Shot Time Series Forecasting: A Darts Foundation

[Submitted on 25 Jun 2026]

Title:Unified Zero-Shot Time Series Forecasting: A Darts Foundation

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Abstract:Since its initial release in 2020, Darts has become a widely used open-source Python library for time series analysis. A series of foundation models have recently claimed accuracy improvements in zero-shot forecasting, promising a paradigm shift from training custom models to harnessing pre-trained general-purpose forecasters. Foundation models, however, are often released as isolated packages with fragmented interfaces and limited interoperability with common tooling, making joint evaluation and integration within complete pipelines difficult. In Darts, we developed a unified $\texttt{FoundationModel}$ class collection (Chronos-2, TimesFM 2.5, TiRex, PatchTST-FM) that provides standardized, full-cycle forecasting interfaces with minimal external dependencies for integrating foundation models into the ecosystem. Existing Darts pipelines can now use foundation models with only a name change; new pipelines can use them for zero-shot or fine-tuned forecasting, uncertainty estimation, and backtesting, combined with data processing and evaluation tooling, all within a unified framework.

Subjects:

Machine Learning (cs.LG)

Cite as: arXiv:2606.27438 [cs.LG]

(or arXiv:2606.27438v1 [cs.LG] for this version)

https://doi.org/10.48550/arXiv.2606.27438

arXiv-issued DOI via DataCite

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From: Zhihao Dai [view email] [v1] Thu, 25 Jun 2026 18:00:37 UTC (140 KB)

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Key points

  • Darts unifies Chronos-2, TimesFM 2.5, TiRex, and PatchTST-FM under a single FoundationModel interface
  • Supports zero-shot, fine-tuned forecasting, uncertainty estimation, and backtesting
  • Existing pipelines require only a model name change to leverage foundation models

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