[MITgcm-support] Using the "gencost" and "genctrl" approach for adjoint sensitivities
gael forget
gforget at mit.edu
Thu Sep 15 08:31:38 EDT 2016
Hi Dan,
there is an example for what you are aiming to do with gencost in
http://mitgcm.org/viewvc/*checkout*/MITgcm/MITgcm_contrib/verification_other/global_oce_cs32/input_ad.sens/data.ecco
where the first cost term is for tracer, the second is for transport, and
data.profiles is empty (so it is effectively turned off — but you can also do this via
packages.conf and data.pkg). The cost function location (space and time) is specified
at run-time via masks (south30_mask* and north10_mask*) that were created using
http://mitgcm.org/viewvc/*checkout*/MITgcm/MITgcm_contrib/verification_other/global_oce_cs32/input_ad.sens/some_mask.m
The genctrl settings for this experiment are in
http://mitgcm.org/viewvc/*checkout*/MITgcm/MITgcm_contrib/verification_other/global_oce_cs32/input_ad/data.ctrl
and provide examples for forcing, initial condition, and internal parameter controls.
I will add some documentation in the manual shortly about this.
Cheers,
Gael
On Sep 15, 2016, at 6:49 AM, Dan Jones <dcjones.work at gmail.com> wrote:
> Hi all,
>
> I have some questions about using "gencost" and "genctrl". To be concrete, I'll pick a specific example below. In this example, I am *not* generating a state estimate - I am interested in examining the gradients themselves (i.e. \partial J / \partial x, where J is the cost function and x is some control variable).
>
> I would like to start with an up-to-date verification exercise (MITgcm_contrib/verification_other/global_oce_biogeo_bling). I want to modify this setup such that:
>
> - The cost function is the value of one of the tracer fields, at a location specified at run-time, averaged over the last 'x' seconds
> - The cost function should *not* include any contributions from "profiles"; how do I turn off those parts entirely? Does just dropping the package from the packages.conf list work?
> - The controls include physical variables (e.g. u, v, T, S) *and* tracer fields (e.g. DIC)
>
> How do I need to modify the headers/source code to specify this? I am using TAF to generate the adjoint code.
>
> I have looked at the comments in the header files, but as this approach is new I am feeling a bit uncertain about it. Any help/clarification is very much appreciated!
>
> Best,
> Dan
>
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