Terminology

A function G = G(X,W) is called a d-contracting function: if for all X there exist a W such that

• probabilistic
• norm

Versatile function:

for all S?{0,1}k and all X?Rn, there exists a

vector W?Rm such that: G(X,W) = S

e-Revealing function: I(W,S ? e)

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