.. _method-approximate_control_variate-nip:

"""
nip
"""


Uses a nonlinear interior point method for underlying optimization


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**Specification**

- *Alias:* None

- *Arguments:* None


**Description**


Many uncertainty quantification methods solve a constrained optimization problem under the hood.  The ``nip`` keyword directs Dakota to use a nonlinear interior point to solve that problem.  A nonlinear interior point method traverses the interior of the feasible region to arrive at the solution to the optimization problem.