Hello, I have checked in a bunch of modifications I have finished during the hackathon prior to ApacheCon Europe. There are two parts in these modifications.
The first part is another attempt at the API, in order to improve consistency between the analysis and the optimization package. The almost duplicated functions definitions between the two packages and put them all in the analysis package have been removed. The classes/interfaces names have also been made more consistent and explicit. Unfortunately, we end up with very long names in the optimization package (look at the MultiStart algorithm for example). Could someone give a look at the current state of API and documentation and give some feedback about it ? One thing I have not done yet is updated the univariate API (added recently after Gilles contribution to the former analysis.minimization package). It is unnecessarily different from the other optimizers in the methods inherited from ConvergingAlgorithm (getIterationsCount instead of getIterations ...). The second part is the addition of the non-linear conjugate gradient method. This was a main goal for 2.0. This algorithm allow to optimize multivariate real valued functions. Before that, we could only solve least-squares problems with either Gauss-Newton or Levenberg-Marquardt. The implementation supports both Fletcher-Reeves and Polak-Ribière update formulas for the conjugate directions. It also support setting up an optional preconditioner. Things that remain to be done in this field are: - improve test coverage - improve validation (if someone could add some test problems to the suite, it would be fine) - add the linear package (I add a direct confirmation here at the conference that the required paperwork was officially filed, so the contribution from Benjamin on Jira can be checked in now) This change is an important step towards 2.0. I hope we will be able to release it soon. Luc --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org For additional commands, e-mail: dev-h...@commons.apache.org
