Tunable
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class Tunable
A tunable parameter attempts to reach a target value of acceptance by modifying it by a percentage.
The parameter value is changed by the following formula:
value *= 1 + percent_change*(actual - target)
where actual is the average trial acceptance and target is the target trial acceptance. The relationship between the target and the parameter is assumed by the sign of percent_change. By default, the precent_change = 1, which leads to an inverse relationship between the parameter value and the trial acceptance. For example, a maximum displacement parameter with an actual acceptance of 32% and a target acceptance of 25% would be increased by 7% in an attempt to bring the acceptance down to the target value.