.. _method-surrogate_based_local-constraint_relax:

""""""""""""""""
constraint_relax
""""""""""""""""


Enable constraint relaxation


.. toctree::
   :hidden:
   :maxdepth: 1

   method-surrogate_based_local-constraint_relax-homotopy


**Specification**

- *Alias:* None

- *Arguments:* None

- *Default:* no relaxation


**Child Keywords:**

+-------------------------+--------------------+--------------------+---------------------------------------------+
| Required/Optional       | Description of     | Dakota Keyword     | Dakota Keyword Description                  |
|                         | Group              |                    |                                             |
+=========================+====================+====================+=============================================+
| Required                                     | `homotopy`__       | Surrogate-Based local constraint relaxation |
|                                              |                    | method for infeasible iterates              |
+----------------------------------------------+--------------------+---------------------------------------------+

.. __: method-surrogate_based_local-constraint_relax-homotopy.html



**Description**


The command ``constraint_relax`` followed by a method name specifies
the type of relaxation to be used. Currently, <tt>homotopy</tt>
:cite:p:`Per04a` is the only available method for
constraint relaxation, and this method is dependent on the presence of
the NPSOL library within the Dakota executable.