https://astralcodexten.substack.com/p/link-unifying-predictive-coding-with
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[epistemic status: I know a little about the predictive coding side of this, but almost nothing about backpropagation or the math behind the unification. I am posting this mostly as a link to people who know more.]
This is a link to / ad for a great recent Less Wrong post by lsusr,\xa0Predictive Coding Has Been Unified With Backpropagation, itself about a recent paper\xa0Predictive Coding Approximates Backprop Along Arbitrary Computation Graphs.
Predictive coding is the most plausible current theory of how the brain works. I\u2019ve written about it elsewhere, especially\xa0here.