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[1] https://www.quora.com/What-is-the-difference-between-squared-error-and-absolute-error
[2] https://www.quora.com/Are-there-instances-where-root-mean-squared-error-might-be-used-rather-than-mean-absolute-error
[3] https://www.quora.com/How-would-a-model-change-if-we-minimized-absolute-error-instead-of-squared-error-What-about-the-other-way-around
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