.. _method-multilevel_blue-nip:

"""
nip
"""


Use a nonlinear interior point method for solving an optimization sub-problem



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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 algorithm to solve the subproblem.
A nonlinear interior point method traverses the interior of the feasible
region to arrive at the optimal solution.