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# POWELL¶

class POWELL(maxiter=None, maxfev=1000, disp=False, xtol=0.0001, tol=None, options=None, **kwargs)[código fonte]

Bases: `SciPyOptimizer`

Powell optimizer.

The Powell algorithm performs unconstrained optimization; it ignores bounds or constraints. Powell is a conjugate direction method: it performs sequential one-dimensional minimization along each directional vector, which is updated at each iteration of the main minimization loop. The function being minimized need not be differentiable, and no derivatives are taken.

Uses scipy.optimize.minimize Powell. For further detail, please refer to See https://docs.scipy.org/doc/scipy/reference/generated/scipy.optimize.minimize.html

Parâmetros
• maxiter (int | None) – Maximum allowed number of iterations. If both maxiter and maxfev are set, minimization will stop at the first reached.

• maxfev (int) – Maximum allowed number of function evaluations. If both maxiter and maxfev are set, minimization will stop at the first reached.

• disp (bool) – Set to True to print convergence messages.

• xtol (float) – Relative error in solution xopt acceptable for convergence.

• tol (float | None) – Tolerance for termination.

• options (dict | None) – A dictionary of solver options.

• kwargs – additional kwargs for scipy.optimize.minimize.

Methods

 `get_support_level` Return support level dictionary `gradient_num_diff` We compute the gradient with the numeric differentiation in the parallel way, around the point x_center. `minimize` Minimize the scalar function. `print_options` Print algorithm-specific options. `set_max_evals_grouped` Set max evals grouped `set_options` Sets or updates values in the options dictionary. `wrap_function` Wrap the function to implicitly inject the args at the call of the function.

Attributes

bounds_support_level

Returns bounds support level

initial_point_support_level

Returns initial point support level

is_bounds_ignored

Returns is bounds ignored

is_bounds_required

Returns is bounds required

is_bounds_supported

Returns is bounds supported

is_initial_point_ignored

Returns is initial point ignored

is_initial_point_required

Returns is initial point required

is_initial_point_supported

Returns is initial point supported

setting

Return setting

settings