cma.constraints_handler.CountLastSameChanges

class documentation

class CountLastSameChanges:

An array/list of successive same-sign counts.

.same_changes[i] counts how often the same sign was successively observed during update(..., i, change). When the sign flips, .same_changes[i] is reset to 1 or -1.

init needs to be called before the class instance can be used. A valid use case is lsc = CountLastSameChanges().init(dimension).

TODO: parameters may need to depend on population size?

Method	`__init__`	Undocumented
Method	`init`	do not overwrite user-set values unless `force`
Method	`shape_exponent`	return value to be added to exponent from change count.
Method	`update`	update `same_changes[i]` count based on the sign of `change`
Instance Variable	`chi_exponent_factor`	increase chi exponent up to given threshold, can make up for dimension dependent chi
Instance Variable	`chi_exponent_threshold`	Undocumented
Instance Variable	`parent`	count of the number of changes with the same sign, where
Instance Variable	`same_changes`	Undocumented
Property	`dimension`	Undocumented

def __init__(self, parent=None): ¶

Undocumented

def init(self, dimension, force=False): ¶

do not overwrite user-set values unless force

def shape_exponent(self, i): ¶

return value to be added to exponent from change count.

return a positive/negative value (or zero) when the last change was respectively postive/negative.

The value is zero for the first chi_exponent_threshold same changes and increases linearly for the next chi_exponent_threshold same changes and then stays at the threshold value as long as the change does not flip sign.

def update(self, i, change): ¶

update same_changes[i] count based on the sign of change

chi_exponent_factor = ¶

increase chi exponent up to given threshold, can make up for dimension dependent chi

chi_exponent_threshold = ¶

Undocumented

parent = ¶

count of the number of changes with the same sign, where

same_changes = ¶

Undocumented

@property
dimension = ¶

Undocumented