Blurb::
The merit function by Vanderbei and Shanno
Description::
The "van_shanno" merit function can be classified as a penalty
function for the logarithmic barrier formulation of the nonlinear
programming problem. The cost per linesearch iteration is one function
evaluation. For more information see :cite:p:`VanShanno1999`.

If the function evaluation is expensive or noisy, set the
``merit_function`` to "argaez_tapia" or "van_shanno".
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