[MITgcm-support] tutorial_global_oce_optim optimisation failed

[Matthew Mazloff]

Hello

Its been awhile, but I am pretty sure that is the normal output. It says “fail", but it did give you a new and ecco_ctrl_MIT_CE_000.opt0001 (correct?) and if you unpack and run likely the cost will descend.

I think it worked correctly. lsopt/optim are just confusing…but I think its working. I think all is good!

Matt



> On Apr 27, 2018, at 8:25 AM, Andrew McRae <andrew.mcrae at physics.ox.ac.uk> wrote:
> 
> Just separating this from the other thread <http://mailman.mitgcm.org/pipermail/mitgcm-support/2018-April/011521.html>, I got the bundled MITgcm optim routine built (having made these changes <https://github.com/MITgcm/MITgcm/compare/master...dorugeber:optim_fix>, based on this <http://mailman.mitgcm.org/pipermail/mitgcm-support/2010-September/006825.html> thread from 2010 and this <http://mailman.mitgcm.org/pipermail/mitgcm-support/2016-July/010527.html> one from 2016).
> 
> I use OpenAD to create the adjoint.
> 
> My steps are:
> 1) in the build directory, run ../../../tools/genmake2 -oad -mods=../code_oad
> 2) run make depend and make adAll
> 3) copy input_oad/ into a new folder scratch/
> 4) within scratch/, run ./prepare_run
> 5) copy mitgcmuv_ad from build/ into scratch/, copy optim.x into scratch/OPTIM/
> 6) run ./mitgcmuv_ad
> 7) in scratch/OPTIM, create symlinks to ../data.optim and ../data.ctrl
> 8) copy the files ecco_cost_MIT_CE_000.opt0000 and ecco_ctrl_MIT_CE_000.opt0000 into the OPTIM subdirectory
> 9) run ./optim.x within the subdirectory
> 
> The full output is attached, but I assume the optimisation failed since the last lines are
> 
>   optimization stopped because :
>   ifail =   4    the search direction is not a descent one
> 
> Any ideas?  (I guess this isn't something that is tested in the daily builds?)
> 
> In the meantime, I'll try the m1qn3 routine as in the other thread, which should help distinguish between a problem with the optimisation routine or the gradient generated by mitgcmuv_ad.
> 
> Andrew
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