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package org.apache.commons.math3.optimization.general;
Available choices of update formulas for the β parameter in NonLinearConjugateGradientOptimizer.
The β parameter is used to compute the successive conjugate
search directions. For non-linear conjugate gradients, there are
two formulas to compute β:
- Fletcher-Reeves formula
- Polak-Ribière formula
On the one hand, the Fletcher-Reeves formula is guaranteed to converge
if the start point is close enough of the optimum whether the
Polak-Ribière formula may not converge in rare cases. On the
other hand, the Polak-Ribière formula is often faster when it
does converge. Polak-Ribière is often used.
See Also: Deprecated: As of 3.1 (to be removed in 4.0). Since: 2.0
/**
* Available choices of update formulas for the β parameter
* in {@link NonLinearConjugateGradientOptimizer}.
* <p>
* The β parameter is used to compute the successive conjugate
* search directions. For non-linear conjugate gradients, there are
* two formulas to compute β:
* <ul>
* <li>Fletcher-Reeves formula</li>
* <li>Polak-Ribière formula</li>
* </ul>
* On the one hand, the Fletcher-Reeves formula is guaranteed to converge
* if the start point is close enough of the optimum whether the
* Polak-Ribière formula may not converge in rare cases. On the
* other hand, the Polak-Ribière formula is often faster when it
* does converge. Polak-Ribière is often used.
* <p>
* @see NonLinearConjugateGradientOptimizer
* @deprecated As of 3.1 (to be removed in 4.0).
* @since 2.0
*/
@Deprecated
public enum ConjugateGradientFormula {
Fletcher-Reeves formula. /** Fletcher-Reeves formula. */
FLETCHER_REEVES,
Polak-Ribière formula. /** Polak-Ribière formula. */
POLAK_RIBIERE
}