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crossval.F90
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crossval.F90
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!#define DEBUG
#define VERBOSE
module cross_validation
! constants for mask
integer, parameter :: sea = 1
integer, parameter :: land = 0
contains
subroutine crossval(mask,nb,cloud_size,len,valex,X,iex,jex,mex,kex,Xex)
implicit none
! argumets
integer, intent(in) :: mask(:,:)
integer, intent(in) :: nb,cloud_size
real, intent(in) :: len(3)
real, intent(in) :: valex
real, intent(inout) :: X(:,:)
integer, intent(out) :: iex(nb), jex(nb), mex(nb), kex(nb)
real, intent(out) :: Xex(nb)
! local constants
integer, parameter :: stencil = 1
! local variables
real :: prop(2*stencil+1,2*stencil+1,2*stencil+1)
integer :: imax,jmax,kmax,N,l,nbseeds,mmax
integer :: i,j,k,ip,jp,kp,m,nz,nzn
logical :: already_exclued
real :: pmax,count,tprop,rand
integer, allocatable :: mindex(:,:), iindex(:), jindex(:)
imax = size(mask,1);
jmax = size(mask,2);
kmax = size(X,2);
Xex = 0;
N = imax*jmax*kmax;
mmax = sum(mask);
allocate(mindex(imax,jmax),iindex(mmax),jindex(mmax))
do kp=-stencil,stencil
do jp=-stencil,stencil
do ip=-stencil,stencil
prop(ip+stencil+1,jp+stencil+1,kp+stencil+1) = &
exp(- (ip/len(1))**2 - (jp/len(2))**2 - (kp/len(3))**2 );
end do
end do
end do
prop(2,2,2) = 0;
nz = 0;
nzn = 0;
iex = 0
jex = 0
kex = 0
mex = 0
nbseeds = nb/cloud_size
! maps index (i,j) to linear index m according to land-sea mask
m = 0
mindex = -1
! change ReadMatrix
! do j=1,jmax
! do i=1,imax
do i=1,imax
do j=1,jmax
if (mask(i,j) .eq. sea) then
m = m+1;
mindex(i,j) = m
iindex(m) = i
jindex(m) = j
end if
end do
end do
! seeds for clouds
nz = 0
do while (nz .lt. nbseeds)
m = random_integer(1,mmax)
k = random_integer(1,kmax)
if (X(m,k) .ne. valex) then
nz = nz+1;
iex(nz) = iindex(m);
jex(nz) = jindex(m);
kex(nz) = k;
mex(nz) = m;
Xex(nz) = X(m,k);
X(m,k) = valex;
end if
end do
! expand clouds
do while (nz .lt. nb)
# ifdef DEBUG
write(6,*) 'nz ',nz
# endif
! choose one clouded point
l = random_integer(1,nz)
i = iex(l);
j = jex(l);
k = kex(l);
m = mex(l);
! choose one point in its neighbourhood
kp= random_integer(max(k-stencil,1),min(k+stencil,kmax))
jp= random_integer(max(j-stencil,1),min(j+stencil,jmax))
ip= random_integer(max(i-stencil,1),min(i+stencil,imax))
call random_number(rand)
if (rand .lt. prop(ip-i+stencil+1,jp-j+stencil+1,kp-k+stencil+1) .and. mask(ip,jp) .eq. sea) then
m = mindex(ip,jp)
if (X(m,k) .ne. valex) then
nz = nz+1;
iex(nz) = ip;
jex(nz) = jp;
kex(nz) = k;
mex(nz) = m;
Xex(nz) = X(m,k);
X(m,k) = valex;
end if
end if
end do
end subroutine crossval
! returns a pseudo-random integer within [imin imax]
integer function random_integer(imin,imax)
implicit none
integer, intent(in) :: imin,imax
real :: rand
call random_number(rand)
random_integer = imin + (imax-imin+1)*rand
# ifdef DEBUG
if (random_integer .gt. imax .or. random_integer .lt. imin) then
write(6,*) 'random_integer ',random_integer,imin,imax,rand
end if
# endif
! necessary due to finite precision of the product of floats
if (random_integer.gt.imax) random_integer = imax
if (random_integer.lt.imin) random_integer = imin
end function random_integer
end module cross_validation
program cv
use cross_validation
use initfile
use ufileformat
implicit none
include 'ReadMatrix.h'
integer, pointer :: imax(:), jmax(:), first(:)
character(len=200) :: initfilename,filename, cloudsfname,cloudmask_fname
character(len=200), pointer :: datafnames(:),maskfnames(:)
integer :: mmax, nb,v, nbmots, prec, ivalex,m,n,cloud_size
real :: len(3) = (/ 2., 2., 0.5 /);
integer :: i,j,k,l
real :: valex
real, pointer :: mean(:), std(:)
real, pointer :: X(:,:), Xex(:)
! integer, allocatable :: iex(:), jex(:), ijex(:), kex(:), mask(:,:)
integer, pointer :: iex(:), jex(:), ijex(:), kex(:), mask(:,:)
integer, allocatable :: clouds_indexes(:,:)
logical :: isdegen
real, allocatable :: cloud_mask(:,:,:)
! external function
integer :: iargc
if (iargc().ne.1) then
write(0,*) 'Usage: crossval <initfilename>'
stop
end if
call getarg(1,initfilename)
call getInitValue(initfilename,'data',datafnames)
call getInitValue(initfilename,'mask',maskfnames)
call getInitValue(initfilename,'clouds',cloudsfname)
call getInitValue(initfilename,'cloud_size',cloud_size)
v=1
call ReadMatrix(datafnames,X,m,n,valex,maskfnames,0,imax,jmax,first,mean,std)
write(6,*) 'readmatrix done'
call uload(maskfnames(1),mask,ivalex)
mmax = count(mask .eq. sea);
! get or compute the number of cross-validation points
call getInitValue(initfilename,'number_cv_points',nb,default=floor(min(0.01*m*n+40,0.03*m*n)))
#ifdef VERBOSE
write(6,*) 'Sea points according to mask: ',mmax
write(6,*) 'Points for cross validation: ',nb
#endif
allocate( iex(nb), jex(nb), ijex(nb), kex(nb), Xex(nb),clouds_indexes(nb,2))
call crossval(mask,nb,cloud_size,len,valex,X,iex,jex,ijex,kex,Xex)
clouds_indexes(:,1) = ijex;
clouds_indexes(:,2) = kex;
call usave(cloudsfname,real(clouds_indexes),-9999.)
if (presentInitValue(initfilename,'cloud_mask')) then
call getInitValue(initfilename,'cloud_mask',cloudmask_fname)
allocate(cloud_mask(imax(1),jmax(1),n))
cloud_mask = 1
do l=1,nb
cloud_mask(iex(l),jex(l),kex(l))=0
end do
call usave(cloudmask_fname,cloud_mask,valex)
deallocate(cloud_mask)
endif
deallocate(X)
end program cv