Medoid splits for efficient random forests in metric spaces

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An adaptation of the random forest algorithm for Fréchet regression is revisited, addressing the challenge of regression with random objects in metric spaces. To overcome the limitations of previous approaches, a new splitting rule is introduced, substituting the computationally expensive Fréchet means with a medoid-based approach. The asymptotic equivalence of this method to Fréchet mean-based procedures is demonstrated, along with the consistency of the associated regression estimator. This approach provides a sound theoretical framework and a more efficient computational solution to Fréchet regression, broadening its application to non-standard data types and complex use cases.

OriginalsprogEngelsk
Artikelnummer107995
TidsskriftComputational Statistics and Data Analysis
Vol/bind198
ISSN0167-9473
DOI
StatusUdgivet - 2024

Bibliografisk note

Funding Information:
This work has received funding from the European Union's Horizon 2020 research and innovation program under the Marie Sk\u0142odowska-Curie grant agreement No 956107, \u201CEconomic Policy in Complex Environments (EPOC)\u201D.

Publisher Copyright:
© 2024 The Authors

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