Line-search type with cubic interpolation that satisfies both the sufficient decrease and curvature conditions. This method can take step lengths greater than 1. More-Thuente line-search can be selected with “-tao_ls_type more-thuente”.
**** -*** JORGE J. MORE AND DAVID J. THUENTE, LINE SEARCH ALGORITHMS WITH GUARANTEED SUFFICIENT DECREASE. ACM Trans. Math. Software 20, no. 3 (1994): 286-307.