References: BYRD1995

Provides parameters to tune the limited memory BFGS (LBFGS) optimization [Edit on GitHub]


Keyword descriptions

MAX_F_PER_ITER: integer = 20

Usage: MAX_F_PER_ITER {integer}

Maximum number of force evaluations per iteration(used for the line search) [Edit on GitHub]

MAX_H_RANK: integer = 5

Usage: MAX_H_RANK {integer}

Maximum rank (and consequently size) of the approximate Hessian matrix used by the LBFGS optimizer. Larger values (e.g. 30) will accelerate the convergence behaviour at the cost of a larger memory consumption. [Edit on GitHub]

TRUST_RADIUS: real = -5.29177209E-001

Usage: TRUST_RADIUS {real}

Trust radius used in LBFGS. Not completely in depth tested. Negativ values means no trust radius is used. [Edit on GitHub]

WANTED_PROJ_GRADIENT: real = 1.00000000E-016


Convergence criterion (overrides the general ones):Requested norm threshold of the gradient multiplied by the approximate Hessian. [Edit on GitHub]

WANTED_REL_F_ERROR: real = 1.00000000E-016

Usage: WANTED_REL_F_ERROR {real}

Convergence criterion (overrides the general ones):Requested relative error on the objective functionof the optimizer (the energy) [Edit on GitHub]