Back tracking if the line search produces estimate with larger cost. First value evaluated for bracketing in linesearch. Maximum number of iterations for bracketing. Maximum number of iterations before searching in opposite direction. Type of linesearch algorithm. Maximum iterations of linesearch. Tolerance of the absolute search range. Tolerance of the relative search range. Configure cost function to minimize Specify outer-loop stopping criteria. Specify inner-loop / linesearch criteria. Configuration of Conjugate Gradient algorithm.