**Gradient descent (article) | Khan Academy**
https://www.khanacademy.org/math/multivariable-calculus/applications-of-multivariable-derivatives/optimizing-multivariable-functions/a/what-is-gradient-descent

Gradient descent is an algorithm that numerically estimates where a function outputs its lowest values. That means it finds local minima, but not by setting like we've seen before. Instead of finding minima by manipulating symbols, gradient descent approximates the …

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