.. _method-hybrid:

""""""
hybrid
""""""


Strategy in which a set of methods synergistically seek an optimal design


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

   method-hybrid-id_method
   method-hybrid-output
   method-hybrid-final_solutions
   method-hybrid-sequential
   method-hybrid-embedded
   method-hybrid-collaborative


**Specification**

- *Alias:* None

- *Arguments:* None


**Child Keywords:**

+-------------------------+--------------------+---------------------+-----------------------------------------------+
| Required/Optional       | Description of     | Dakota Keyword      | Dakota Keyword Description                    |
|                         | Group              |                     |                                               |
+=========================+====================+=====================+===============================================+
| Optional                                     | `id_method`__       | Name the method block; helpful when there are |
|                                              |                     | multiple                                      |
+----------------------------------------------+---------------------+-----------------------------------------------+
| Optional                                     | `output`__          | Control how much method information is        |
|                                              |                     | written to the screen and output file         |
+----------------------------------------------+---------------------+-----------------------------------------------+
| Optional                                     | `final_solutions`__ | Number of designs returned as the best        |
|                                              |                     | solutions                                     |
+-------------------------+--------------------+---------------------+-----------------------------------------------+
| Required (Choose One)   | Hybrid Method Type | `sequential`__      | Methods are run one at a time, in sequence    |
|                         |                    +---------------------+-----------------------------------------------+
|                         |                    | `embedded`__        | A subordinate local method provides periodic  |
|                         |                    |                     | refinements to a top-level global method      |
|                         |                    +---------------------+-----------------------------------------------+
|                         |                    | `collaborative`__   | Multiple methods run concurrently and share   |
|                         |                    |                     | information                                   |
+-------------------------+--------------------+---------------------+-----------------------------------------------+

.. __: method-hybrid-id_method.html
__ method-hybrid-output.html
__ method-hybrid-final_solutions.html
__ method-hybrid-sequential.html
__ method-hybrid-embedded.html
__ method-hybrid-collaborative.html



**Description**


In a hybrid minimization method ( ``hybrid``), a set of methods
synergistically seek an optimal design. The relationships among the
methods are categorized as:

- collaborative
- embedded
- sequential

The goal in each case is to exploit the strengths of different
optimization and nonlinear least squares algorithms at different
stages of the minimization process. Global + local hybrids (e.g.,
genetic algorithms combined with nonlinear programming) are a common
example in which the desire for identification of a global optimum is
balanced with the need for efficient navigation to a local optimum.


