Dear all,
I was recently dealing with FORM analysis by using different optimization algorithms (Cobyla, AbdoRackwitsz and SQP). In the manual, "Cases Guide for the Textual User Interface" there is an explanation of the convergence criteria. However, I found it difficult to understand their exact meaning and what each error might represent in FORM iterations. It would be helpful if there was a figure and/or explanation in the manual with illustrating the errors during FORM iterations. Do you agree? Moreover, I could not find any explanation about the different optimization algorithms. I found some external documentation describing the theory behind these algorithms but it would be also helpful that an explanation of how they were implemented in OpenTURNS (OT) is available in the manual. In my case, for example, I experienced convergence problems with Cobyla and then when I steered a parameter (i.e. ρbeg), it seemed that it worked. However, I think that it would be much faster and efficient if the explanation of these parameters and their exact implementation in OT are also available in the manuals. In my case, I only fully understood it after try and error. I would really like to know your experience on this matter. Is there already a more detailed elaboration of the aforementioned issues ? and if yes, where can I find it? If not, I suppose that including the things above in the manual would also help future users of OT and additionally help them understand better the usage of the different criteria and parameters. Thank you in advance for your consideration and let me know your opinion. Cheers, Katerina Rippi DISCLAIMER: This message is intended exclusively for the addressee(s) and may contain confidential and privileged information. If you are not the intended recipient please notify the sender immediately and destroy this message. Unauthorized use, disclosure or copying of this message is strictly prohibited. The foundation 'Stichting Deltares', which has its seat at Delft, The Netherlands, Commercial Registration Number 41146461, is not liable in any way whatsoever for consequences and/or damages resulting from the improper, incomplete and untimely dispatch, receipt and/or content of this e-mail.
_______________________________________________ OpenTURNS users mailing list [email protected] http://openturns.org/mailman/listinfo/users
