The state represents the current point in the state space, and maintains values of a set of StateNodes, such as parameters and trees. Furthermore, the state manages which parts of the model need to be stored/restored and notified that recalculation is appropriate.
|anything that is part of the state|
|store the state to disk every X number of samples so that we can resume computation later on if the process failed half-way.|
|Optional input. Default: -1|