.. _method-bayes_calibration-wasabi-emulator:

""""""""
emulator
""""""""


Use an emulator or surrogate model to evaluate the likelihood function


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

   method-bayes_calibration-wasabi-emulator-gaussian_process
   method-bayes_calibration-wasabi-emulator-pce
   method-bayes_calibration-wasabi-emulator-ml_pce
   method-bayes_calibration-wasabi-emulator-mf_pce
   method-bayes_calibration-wasabi-emulator-sc
   method-bayes_calibration-wasabi-emulator-mf_sc


**Specification**

- *Alias:* None

- *Arguments:* None


**Child Keywords:**

+-------------------------+--------------------+----------------------+-----------------------------------------------+
| Required/Optional       | Description of     | Dakota Keyword       | Dakota Keyword Description                    |
|                         | Group              |                      |                                               |
+=========================+====================+======================+===============================================+
| Required (Choose One)   | Emulator Type      | `gaussian_process`__ | Gaussian Process surrogate model              |
|                         |                    +----------------------+-----------------------------------------------+
|                         |                    | `pce`__              | Polynomial Chaos Expansion surrogate model    |
|                         |                    +----------------------+-----------------------------------------------+
|                         |                    | `ml_pce`__           | Multilevel Polynomial Chaos Expansion as an   |
|                         |                    |                      | emulator model.                               |
|                         |                    +----------------------+-----------------------------------------------+
|                         |                    | `mf_pce`__           | Multifidelity Polynomial Chaos Expansion as   |
|                         |                    |                      | an emulator model.                            |
|                         |                    +----------------------+-----------------------------------------------+
|                         |                    | `sc`__               | Stochastic Collocation as an emulator model.  |
|                         |                    +----------------------+-----------------------------------------------+
|                         |                    | `mf_sc`__            | Multifidelity Stochastic Collocation as an    |
|                         |                    |                      | emulator model.                               |
+-------------------------+--------------------+----------------------+-----------------------------------------------+

.. __: method-bayes_calibration-wasabi-emulator-gaussian_process.html
__ method-bayes_calibration-wasabi-emulator-pce.html
__ method-bayes_calibration-wasabi-emulator-ml_pce.html
__ method-bayes_calibration-wasabi-emulator-mf_pce.html
__ method-bayes_calibration-wasabi-emulator-sc.html
__ method-bayes_calibration-wasabi-emulator-mf_sc.html



**Description**


This keyword describes the type of emulator used when calculating the
likelihood function for the Bayesian calibration. The emulator can be
a Gaussian process, polynomial chaos expansion, or stochastic
collocation.


