Gauss–Newton algorithm

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What Wikipedia says

The Gauss–Newton algorithm is used to solve non-linear least squares problems, which is equivalent to minimizing a sum of squared function values. It is an extension of Newton's method for finding a minimum of a non-linear function.

Excerpt from the Wikipedia article “Gauss–Newton algorithm”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Cdang (Christophe Dang Ngoc Chan), CC BY-SA 3.0, via Wikimedia Commons.