A geometric program (GP) is an optimization problem of the form
In the context of geometric programming (unlike all other disciplines), a monomial is defined as a function with defined as
where and .
GPs have numerous application, such as components sizing in IC design[1] and parameter estimation via logistic regression in statistics. The maximum likelihood estimator in logistic regression is a GP.
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Geometric programs are not (in general) convex optimization problems, but they can be transformed to convex problems by a change of variables and a transformation of the objective and constraint functions. In particular, defining , the monomial , where . Similarly, if is the posynomial
then , where and . After the change of variables, a posynomial becomes a sum of exponentials of affine functions.