no_expansion
Don’t allow expansion of the search pattern
Specification
Alias: None
Arguments: None
Default: algorithm may expand pattern size
Description
In general, pattern search methods can expand and contract their step
lengths. SCOLIB pattern search methods contract the step length by
the value contraction_factor, and they expand the step length by
the value (1/contraction_factor). The expand_after_success control
specifies how many successful objective function improvements must
occur with a specific step length prior to expansion of the step
length, whereas the no_expansion flag instructs the algorithm to
forgo pattern expansion altogether.
