simpeg.optimization.ProjectedGradient.modifySearchDirection#

ProjectedGradient.modifySearchDirection(p)[source]#

modifySearchDirection changes the search direction based on some sort of linesearch or trust-region criteria.

By default, an Armijo backtracking linesearch is preformed with the following parameters:

  • maxIterLS, the maximum number of linesearch iterations

  • LSreduction, the expected reduction expected, default: 1e-4

  • LSshorten, how much the step is reduced, default: 0.5

If the linesearch is completed, and a descent direction is found, passLS is returned as True.

Else, a modifySearchDirectionBreak call is preformed.

Parameters:

p (numpy.ndarray) – searchDirection

Return type:

tuple

Returns:

(xt, passLS) numpy.ndarray, bool