minimize(method=’TNC’)#
- scipy.optimize.minimize(fun, x0, args=(), method=None, jac=None, hess=None, hessp=None, bounds=None, constraints=(), tol=None, callback=None, options=None)
Minimize a scalar function of one or more variables using a truncated Newton (TNC) algorithm.
See also
For documentation for the rest of the parameters, see
scipy.optimize.minimize
- Options:
- ——-
- epsfloat or ndarray
If jac is None the absolute step size used for numerical approximation of the jacobian via forward differences.
- scalelist of floats
Scaling factors to apply to each variable. If None, the factors are up-low for interval bounded variables and 1+|x] fo the others. Defaults to None.
- offsetfloat
Value to subtract from each variable. If None, the offsets are (up+low)/2 for interval bounded variables and x for the others.
- dispbool
Set to True to print convergence messages.
- maxCGitint
Maximum number of hessian*vector evaluations per main iteration. If maxCGit == 0, the direction chosen is -gradient if maxCGit < 0, maxCGit is set to max(1,min(50,n/2)). Defaults to -1.
- etafloat
Severity of the line search. If < 0 or > 1, set to 0.25. Defaults to -1.
- stepmxfloat
Maximum step for the line search. May be increased during call. If too small, it will be set to 10.0. Defaults to 0.
- accuracyfloat
Relative precision for finite difference calculations. If <= machine_precision, set to sqrt(machine_precision). Defaults to 0.
- minfevfloat
Minimum function value estimate. Defaults to 0.
- ftolfloat
Precision goal for the value of f in the stopping criterion. If ftol < 0.0, ftol is set to 0.0 defaults to -1.
- xtolfloat
Precision goal for the value of x in the stopping criterion (after applying x scaling factors). If xtol < 0.0, xtol is set to sqrt(machine_precision). Defaults to -1.
- gtolfloat
Precision goal for the value of the projected gradient in the stopping criterion (after applying x scaling factors). If gtol < 0.0, gtol is set to 1e-2 * sqrt(accuracy). Setting it to 0.0 is not recommended. Defaults to -1.
- rescalefloat
Scaling factor (in log10) used to trigger f value rescaling. If 0, rescale at each iteration. If a large value, never rescale. If < 0, rescale is set to 1.3.
- finite_diff_rel_stepNone or array_like, optional
If jac in [‘2-point’, ‘3-point’, ‘cs’] the relative step size to use for numerical approximation of the jacobian. The absolute step size is computed as
h = rel_step * sign(x) * max(1, abs(x))
, possibly adjusted to fit into the bounds. Formethod='3-point'
the sign of h is ignored. If None (default) then step is selected automatically.- maxfunint
Maximum number of function evaluations. If None, maxfun is set to max(100, 10*len(x0)). Defaults to None.