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This is a basic question on the meaning of the following notation. Can someone explain how I would evaluate the Summation forumula below? And perhaps point me to a reference where I can understand how to evaluate?

I am assuming that we are trying to determine max value of S which is part of the set {-1 to 1} where i iterates from 1 to d?

$h(\mathbf x) = \sum_{i=1}^d \max_{s \in \{1,-1\}} s x_i$

StudentAP_2022
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1 Answers1

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Very odd notation, seems to mean the sum of mod $x_i$ i.e for each term in the sum we want the max of ${-x_i,x_i}$ i.e if $x_i$ is positive we add $x_i$ and if $x_i$ is negative we add $-x_i$ (which is a positive term.

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