Feedback Alignment: Turns out, if you send error signals backward through completely random, fixed wires (instead of symmetrical weights like backprop requires), the forward-facing neurons will organically adjust themselves to “align” with that random feedback [9]. The brain doesn’t need perfect math; it just needs a directional nudge.
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And many US firms, especially in tech, still have on their payrolls a glut of workers who were brought on during the pandemic, when there was a small hiring boom. That could also help explain the lack of new vacancies.