.. _method-adaptive_sampling-batch_selection:

"""""""""""""""
batch_selection
"""""""""""""""


(Experimental) How to select new points


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

   method-adaptive_sampling-batch_selection-naive
   method-adaptive_sampling-batch_selection-distance_penalty
   method-adaptive_sampling-batch_selection-topology
   method-adaptive_sampling-batch_selection-constant_liar


**Specification**

- *Alias:* None

- *Arguments:* None

- *Default:* naive


**Child Keywords:**

+-------------------------+--------------------+----------------------+---------------------------------------------+
| Required/Optional       | Description of     | Dakota Keyword       | Dakota Keyword Description                  |
|                         | Group              |                      |                                             |
+=========================+====================+======================+=============================================+
| Required (Choose One)   | Batch Selection    | `naive`__            | Take the highest scoring candidates         |
|                         | Criterion          +----------------------+---------------------------------------------+
|                         |                    | `distance_penalty`__ | Add a penalty to spread out the points in   |
|                         |                    |                      | the batch                                   |
|                         |                    +----------------------+---------------------------------------------+
|                         |                    | `topology`__         | In this selection strategy, we use          |
|                         |                    |                      | information about the topology of the space |
|                         |                    |                      | from the Morse-Smale complex to identify    |
|                         |                    |                      | next points to select.                      |
|                         |                    +----------------------+---------------------------------------------+
|                         |                    | `constant_liar`__    | Use information from the existing surrogate |
|                         |                    |                      | model to predict what the surrogate upgrade |
|                         |                    |                      | will be with new points.                    |
+-------------------------+--------------------+----------------------+---------------------------------------------+

.. __: method-adaptive_sampling-batch_selection-naive.html
__ method-adaptive_sampling-batch_selection-distance_penalty.html
__ method-adaptive_sampling-batch_selection-topology.html
__ method-adaptive_sampling-batch_selection-constant_liar.html



**Description**


``adaptive_sampling`` is an experimental capability that is not ready
for production use at this time.

With batch or multi-point selection, the true model can be evaluated
in parallel and thus increase throughput before refitting our
surrogate model. This proposes a new challenge as the problem of
choosing a single point and choosing multiple points off a surrogate
are fundamentally different. Selecting the ``n`` best scoring
candidates is more than likely to generate a set of points clustered
in one area which will not be conducive to adapting the surrogate.

We have implemented several strategies for batch selection of points.
These are described in the User's manual and are the subject of
active research.

The ``batch_selection`` strategies include:


1. ``naive``:

2. ``distance_penalty``

3. ``constant_liar``

4. ``topology``