.. _method-soga-convergence_type-best_fitness_tracker:

""""""""""""""""""""
best_fitness_tracker
""""""""""""""""""""


Tracks the best fitness of the population


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

   method-soga-convergence_type-best_fitness_tracker-percent_change
   method-soga-convergence_type-best_fitness_tracker-num_generations


**Specification**

- *Alias:* None

- *Arguments:* None


**Child Keywords:**

+-------------------------+--------------------+---------------------+-----------------------------------------------+
| Required/Optional       | Description of     | Dakota Keyword      | Dakota Keyword Description                    |
|                         | Group              |                     |                                               |
+=========================+====================+=====================+===============================================+
| Optional                                     | `percent_change`__  | Define the convergence criterion for JEGA     |
|                                              |                     | methods                                       |
+----------------------------------------------+---------------------+-----------------------------------------------+
| Optional                                     | `num_generations`__ | Define the convergence criterion for JEGA     |
|                                              |                     | methods                                       |
+----------------------------------------------+---------------------+-----------------------------------------------+

.. __: method-soga-convergence_type-best_fitness_tracker-percent_change.html
__ method-soga-convergence_type-best_fitness_tracker-num_generations.html



**Description**


The ``best_fitness_tracker`` tracks the best fitness in the
population. Convergence occurs after ``num_generations`` has passed and
there has been less than ``percent_change`` in the best fitness
value. The percent change can be as low as 0% in which case there must
be no change at all over the number of generations.


