Preprint
Jul 2026
Weight Feedback Computes the Jacobian Transpose Locally in Modern Deep Networks
Predictive Coding (PC) offers a biologically motivated alternative to backpropagation via local weight updates, yet routing error between layers still relies on an autograd Jacobian-transpose ($J^\top$) product - the last non-local operation in PC. We show that this dependency is largely avoidable. For any layer $f(x)=...
Junlong Shen, Xingyu Li
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