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costf.f90
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costf.f90
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subroutine costf
!---------------------------------------------------------------------------
! !
! Copyright 2018 Anna Teruzzi, OGS, Trieste !
! !
! This file is part of 3DVarBio.
! 3DVarBio is based on OceanVar (Dobricic, 2006) !
! !
! 3DVarBio is free software: you can redistribute it and/or modify. !
! it under the terms of the GNU General Public License as published by !
! the Free Software Foundation, either version 3 of the License, or !
! (at your option) any later version. !
! !
! 3DVarBio is distributed in the hope that it will be useful, !
! but WITHOUT ANY WARRANTY; without even the implied warranty of !
! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the !
! GNU General Public License for more details. !
! !
! You should have received a copy of the GNU General Public License !
! along with OceanVar. If not, see <http://www.gnu.org/licenses/>. !
! !
!---------------------------------------------------------------------------
!-----------------------------------------------------------------------
! !
! Calclate the cost function and its gradient !
! !
! Version 1: A. Teruzzi 2018 !
!-----------------------------------------------------------------------
use set_knd
use drv_str
use obs_str
use grd_str
use eof_str
use ctl_str
use mpi_str
implicit none
integer :: ierr
! -------------------------------------------------------
! calculate backgorund cost term
! -------------------------------------------------------
ctl%f_b = 0.5 * dot_product( ctl%x_c, ctl%x_c)
call MPI_Allreduce(MPI_IN_PLACE, ctl%f_b, 1, MPI_REAL8, MPI_SUM, Var3DCommunicator, ierr)
! write(*,*) 'COSTF f_b = ', ctl%f_b
! -------------------------------------------------------
! calculate observational cost term
! -------------------------------------------------------
! --------
! Convert the control vector to v
call cnv_ctv
! --------
! Control to physical space
call ver_hor
! --------
! Apply observational operators
call obsop
! --------
! Calculate residuals
call resid
! --------
! calculate cost
ctl%f_o = 0.5 * dot_product( obs%amo, obs%amo)
call MPI_Allreduce(MPI_IN_PLACE, ctl%f_o, 1, MPI_REAL8, MPI_SUM, Var3DCommunicator, ierr)
! -------------------------------------------------------
! Cost function
! -------------------------------------------------------
ctl%f_c = ctl%f_b + ctl%f_o
if(MyId .eq. 0) &
print*,' Cost function ',ctl%f_c, '(iter.',drv%MyCounter,')'
! -------------------------------------------------------
! calculate the cost function gradient
! -------------------------------------------------------
! --------
! Reset the increments
call res_inc
! --------
! Observational operators
call obsop_ad
! --------
! Control to physical space
call ver_hor_ad
! write(*,*) 'COSTF sum(ro_ad) = ' , sum(grd%ro_ad)
! --------
! Convert the control vector
call cnv_ctv_ad
! -------------------------------------------------------
! Cost function gradient
! -------------------------------------------------------
! write(*,*) 'COSTF sum(g_c) = ' , sum( ctl%g_c)
ctl%g_c(:) = ctl%x_c(:) + ctl%g_c(:) ! OMP
end subroutine costf