bundles / scipy 1.18.0 / scipy / optimize / _linesearch / line_search_wolfe1

function

`scipy.optimize._linesearch:line_search_wolfe1`

source: /scipy/optimize/_linesearch.py:37

Signature

def line_search_wolfe1(f, fprime, xk, pk, gfk = None, old_fval = None, old_old_fval = None, args = (), c1 = 0.0001, c2 = 0.9, amax = 50, amin = 1e-08, xtol = 1e-14)

Summary

As scalar_search_wolfe1 but do a line search to direction pk.

Extended Summary

This implements the DCSRCH function of MINPACK.

Parameters

f : callable: Function f(x)
fprime : callable: Gradient of f
xk : array_like: Current point
pk : array_like: Search direction
gfk : array_like, optional: Gradient of f at point xk
old_fval : float, optional: Value of f at point xk
old_old_fval : float, optional: Value of f at point preceding xk
The rest of the parameters are the same as for `scalar_search_wolfe1`.

Returns

: stp, f_count, g_count, fval, old_fval: As in line_search_wolfe1
gval : array: Gradient of f at the final point

Notes

Parameters c1 and c2 must satisfy 0 < c1 < c2 < 1.

Aliases

scipy.optimize._linesearch.line_search