Operator schedule – transform
This determine the transformation used when optimisation coercible parameters of operators.
Let \(c\) be the number of times the operator schedule selected an operator to optimise.
The coercible parameters is updated with a weight proportional to \(1/c\), if transform is none
, \(1/\log(c)\) if transform is log
and \(1/\sqrt(c)\) if transform is sqrt
.
To guarantee auto optimisation stops changing the operators, sqrt
and log
should not be used (page 66-69, Fagundes De Carvalho, 2018).
References
Fagundes De Carvalho LM. Statistical approaches to viral phylodynamics (Doctoral dissertation, University of Edinburgh). 2018. online.