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 October 20th, 2019, 03:00 AM #1 Member   Joined: Dec 2018 From: Amsterdam Posts: 38 Thanks: 2 What does this mean? What does this sentence mean: So if ${\cal X}$ is the input space and ${\cal W}$ the set of rules such that for $f\in {\cal W}$ and $x\in {\cal X}$ we have $f(x)\in \{-1,1\}$. What does $f(x)\in \{-1,1\}$. mean here?
 October 20th, 2019, 07:50 AM #2 Global Moderator   Joined: Dec 2006 Posts: 21,105 Thanks: 2324 I think it means that $f(x)$ is either -1 or 1, but I'd be more confident if I knew the full context. Thanks from topsquark, idontknow, jenniferruurs and 1 others

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