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2020[update], more than 16,000 packages are available. CRAN was created by Kurt Hornik and Friedrich Leisch in 1997, with the name paralleling other early packing
Universal approximation theorem
George Cybenko in 1989 proved it for sigmoid activation functions. Kurt Hornik [de], Maxwell Stinchcombe, and Halbert White showed in 1989 that multilayer
functionality. The Comprehensive R Archive Network (CRAN) was founded in 1997 by Kurt Hornik and Friedrich Leisch to host R's source code, executable files, documentation
Brian D. Ripley
"Contributors". The R Foundation. April 2024. Retrieved 9 June 2024. Kurt Hornik and the R Core Team (2023). "R FAQ: What is R?". CRAN. Retrieved 9 June
was generalised to feed-forward multi-layer architectures in 1991 by Kurt Hornik. Recent work also showed that universal approximation also holds for