bundles / scipy 1.17.1 / 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

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