backpropagation-history-werbos-not-rumelhart

IN premise — entries/2026/06/21/wiki-Neural_network_28machine_learning29-chunk-8.md

Created 2026-06-21T09:55:52+00:00

Backpropagation was not invented by Rumelhart/Hinton/Williams (1986) — they popularized it; Werbos described it in 1975 (thesis) and 1982 (publication), and Linnainmaa formalized reverse-mode automatic differentiation in 1970.

Dependents

These beliefs depend on this one:

• IN backprop-fragmented-discovery-history — Backpropagation was independently discovered at least three times across 16 years — Linnainmaa (1970), Werbos (1974/1982), Rumelhart/Hinton/Williams (1986) — making it one of the most multiply-discovered algorithms in computer science.