.. _method-adaptive_sampling-fitness_metric-gradient:

""""""""
gradient
""""""""


Fill the range space of the surrogate


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



**Specification**

- *Alias:* None

- *Arguments:* None


**Description**


The gradient metric calculates the score as the absolute value of the difference
in range space (the outputs) of the two points. The output values used are
predicted from the surrogate model.
This method attempts to evenly fill the range space of the surrogate.


