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mirror of https://github.com/pfloos/quack synced 2024-12-22 04:14:26 +01:00

implement 1RDM and 2RDM for pCCD

This commit is contained in:
Pierre-Francois Loos 2024-08-16 19:05:11 +02:00
parent 0283032a52
commit 42565f95f1
4 changed files with 315 additions and 76 deletions

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@ -1,16 +0,0 @@
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@ -1,4 +1,4 @@
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@ -1,4 +1,4 @@
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N 0.0000 0.0000 1.1007
N 0.0000 0.0000 -0.5475132
N 0.0000 0.0000 0.5475132

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@ -35,15 +35,26 @@ subroutine pCCD(dotest,maxSCF,thresh,max_diis,nBas,nC,nO,nV,nR,ERI,ENuc,ERHF,eHF
double precision,allocatable :: OVVO(:,:)
double precision,allocatable :: VVVV(:,:)
double precision,allocatable :: y(:,:)
double precision,allocatable :: yO(:,:),yV(:,:)
double precision,allocatable :: r(:,:)
double precision,allocatable :: t(:,:)
double precision,allocatable :: z(:,:)
double precision,allocatable :: rdm1(:,:)
double precision,allocatable :: rdm2(:,:,:,:)
double precision,allocatable :: xOO(:,:)
double precision,allocatable :: xVV(:,:)
double precision,allocatable :: xOV(:,:)
double precision :: tr_1rdm
double precision :: tr_2rdm
integer :: O,V
integer :: n_diis
double precision :: rcond
double precision,allocatable :: error_diis(:,:)
double precision,allocatable :: err_diis(:,:)
double precision,allocatable :: t_diis(:,:)
double precision,allocatable :: z_diis(:,:)
double precision,external :: trace_matrix
! Hello world
@ -54,9 +65,14 @@ subroutine pCCD(dotest,maxSCF,thresh,max_diis,nBas,nC,nO,nV,nR,ERI,ENuc,ERHF,eHF
write(*,*)'**************************************'
write(*,*)
! Useful quantities
O = nO - nC
V = nV - NR
! Form energy denominator
allocate(eO(nO-nC),eV(nV-nR),delta_OV(nO-nC,nV-nR))
allocate(eO(O),eV(V),delta_OV(O,V))
eO(:) = eHF(nC+1:nO)
eV(:) = eHF(nO+1:nBas-nR)
@ -65,62 +81,56 @@ subroutine pCCD(dotest,maxSCF,thresh,max_diis,nBas,nC,nO,nV,nR,ERI,ENuc,ERHF,eHF
! Create integral batches
allocate(OOOO(nO-nC,nO-nC),OOVV(nO-nC,nV-nR),OVOV(nO-nC,nV-nR),OVVO(nO-nC,nV-nR),VVVV(nV-nR,nV-nR))
allocate(OOOO(O,O),OOVV(O,V),OVOV(O,V),OVVO(O,V),VVVV(V,V))
do i=1,nO-nC
do j=1,nO-nC
do i=1,O
do j=1,O
OOOO(i,j) = ERI(nC+i,nC+i,nC+j,nC+j)
end do
end do
do i=1,nO-nC
do a=1,nV-nR
do i=1,O
do a=1,V
OOVV(i,a) = ERI(nC+i,nC+i,nO+a,nO+a)
OVOV(i,a) = ERI(nC+i,nO+a,nC+i,nO+a)
OVVO(i,a) = ERI(nC+i,nO+a,nO+a,nC+i)
end do
end do
do a=1,nV-nR
do b=1,nV-nR
do a=1,V
do b=1,V
VVVV(a,b) = ERI(nO+a,nO+a,nO+b,nO+b)
end do
end do
! MP2 guess amplitudes
! Initialization
allocate(t(nO-nC,nV-nR))
t(:,:) = -0.5d0*OOVV(:,:)/delta_OV(:,:)
EcCC = 0d0
do i=1,nO-nC
do a=1,nV-nR
EcCC = EcCC + OOVV(i,a)*t(i,a)
end do
end do
allocate(t(O,V),r(O,V),yO(O,O),yV(V,V))
! Memory allocation for DIIS
allocate(error_diis((nO-nC)*(nV-nR),max_diis),t_diis((nO-nC)*(nV-nR),max_diis))
allocate(err_diis(O*V,max_diis),t_diis(O*V,max_diis))
! Initialization
allocate(r(nO-nC,nV-nR),y(nO-nC,nO-nC))
!------------------------------------------------------------------------
! Compute t ampltiudes
!------------------------------------------------------------------------
Conv = 1d0
nSCF = 0
ECC = ERHF
EcCC = 0d0
n_diis = 0
t(:,:) = 0d0
t_diis(:,:) = 0d0
error_diis(:,:) = 0d0
err_diis(:,:) = 0d0
!------------------------------------------------------------------------
! Main SCF loop
!------------------------------------------------------------------------
write(*,*)
write(*,*)'----------------------------------------------------'
write(*,*)'| pair CCD calculation |'
write(*,*)'| pCCD calculation: t amplitudes |'
write(*,*)'----------------------------------------------------'
write(*,'(1X,A1,1X,A3,1X,A1,1X,A16,1X,A1,1X,A10,1X,A1,1X,A10,1X,A1,1X)') &
'|','#','|','E(pCCD)','|','Ec(pCCD)','|','Conv','|'
@ -134,28 +144,22 @@ subroutine pCCD(dotest,maxSCF,thresh,max_diis,nBas,nC,nO,nV,nR,ERI,ENuc,ERHF,eHF
! Form intermediate array
y(:,:) = 0d0
do i=1,nO-nC
do j=1,nO-nC
do b=1,nV-nR
y(i,j) = y(i,j) + OOVV(j,b)*t(i,b)
end do
end do
end do
yO(:,:) = matmul(t,transpose(OOVV))
! Compute residual
do i=1,nO-nC
do a=1,nV-nR
r(i,a) = OOVV(i,a) + 2d0*delta_OV(i,a)*t(i,a) &
- 2d0*(2d0*OVOV(i,a) - OVVO(i,a) - OOVV(i,a)*t(i,a))*t(i,a)
r(:,:) = OOVV(:,:) + 2d0*delta_OV(:,:)*t(:,:) &
- 2d0*(2d0*OVOV(:,:) - OVVO(:,:) - OOVV(:,:)*t(:,:))*t(:,:)
do j=1,nO-nC
r(i,a) = r(i,a) - 2d0*OOVV(j,a)*t(j,a)*t(i,a) + OOOO(j,i)*t(j,a) + y(i,j)*t(j,a)
do i=1,O
do a=1,V
do j=1,O
r(i,a) = r(i,a) - 2d0*OOVV(j,a)*t(j,a)*t(i,a) + OOOO(j,i)*t(j,a) + yO(i,j)*t(j,a)
end do
do b=1,nV-nR
do b=1,V
r(i,a) = r(i,a) - 2d0*OOVV(i,b)*t(i,b)*t(i,a) + VVVV(a,b)*t(i,b)
end do
@ -172,12 +176,7 @@ subroutine pCCD(dotest,maxSCF,thresh,max_diis,nBas,nC,nO,nV,nR,ERI,ENuc,ERHF,eHF
! Compute correlation energy
EcCC = 0d0
do i=1,nO-nC
do a=1,nV-nR
EcCC = EcCC + OOVV(i,a)*t(i,a)
end do
end do
EcCC = trace_matrix(V,matmul(transpose(OOVV),t))
! Dump results
@ -185,12 +184,12 @@ subroutine pCCD(dotest,maxSCF,thresh,max_diis,nBas,nC,nO,nV,nR,ERI,ENuc,ERHF,eHF
! DIIS extrapolation
! n_diis = min(n_diis+1,max_diis)
! call DIIS_extrapolation(rcond,nO*nV,nO*nV,n_diis,error_diis,t_diis,-0.5d0*r/delta_OV,t)
if(max_diis > 1) then
! Reset DIIS if required
n_diis = min(n_diis+1,max_diis)
call DIIS_extrapolation(rcond,nO*nV,nO*nV,n_diis,err_diis,t_diis,-0.5d0*r/delta_OV,t)
! if(abs(rcond) < 1d-15) n_diis = 0
end if
write(*,'(1X,A1,1X,I3,1X,A1,1X,F16.10,1X,A1,1X,F10.6,1X,A1,1X,F10.6,1X,A1,1X)') &
'|',nSCF,'|',ECC+ENuc,'|',EcCC,'|',Conv,'|'
@ -201,6 +200,116 @@ subroutine pCCD(dotest,maxSCF,thresh,max_diis,nBas,nC,nO,nV,nR,ERI,ENuc,ERHF,eHF
! End of SCF loop
!------------------------------------------------------------------------
! Did it actually converge?
if(nSCF == maxSCF) then
write(*,*)
write(*,*)'!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!'
write(*,*)' Convergence failed for t ampitudes '
write(*,*)'!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!'
stop
end if
! Deallocate memory
deallocate(err_diis,t_diis)
! Memory allocation
allocate(z(O,V))
! Memory allocation for DIIS
allocate(err_diis(O*V,max_diis),z_diis(O*V,max_diis))
!------------------------------------------------------------------------
! Compute z ampltiudes
!------------------------------------------------------------------------
Conv = 1d0
nSCF = 0
n_diis = 0
z_diis(:,:) = 0d0
err_diis(:,:) = 0d0
!------------------------------------------------------------------------
! Main SCF loop
!------------------------------------------------------------------------
write(*,*)
write(*,*)'----------------------------------------------------'
write(*,*)'| pCCD calculation: z amplitudes |'
write(*,*)'----------------------------------------------------'
write(*,'(1X,A1,1X,A3,1X,A1,1X,A16,1X,A1,1X,A10,1X,A1,1X,A10,1X,A1,1X)') &
'|','#','|','E(pCCD)','|','Ec(pCCD)','|','Conv','|'
write(*,*)'----------------------------------------------------'
do while(Conv > thresh .and. nSCF < maxSCF)
! Increment
nSCF = nSCF + 1
! Form intermediate array
yO(:,:) = matmul(OOVV,transpose(t))
yV(:,:) = matmul(transpose(OOVV),t)
! Compute residual
r(:,:) = OOVV(:,:) + 2d0*delta_OV(:,:)*z(:,:) &
- 2d0*(2d0*OVOV(:,:) - OVVO(:,:) - 2d0*OOVV(:,:)*t(:,:))*z(:,:)
do i=1,O
do a=1,V
do j=1,O
r(i,a) = r(i,a) - 2d0*OOVV(j,a)*t(j,a)*z(i,a) &
- 2d0*OOVV(i,a)*z(j,a)*t(j,a) &
+ OOOO(i,j)*z(j,a) &
+ yO(i,j)*z(j,a)
end do
do b=1,V
r(i,a) = r(i,a) - 2d0*OOVV(i,b)*t(i,b)*z(i,a) &
- 2d0*OOVV(i,a)*z(i,b)*t(i,b) &
+ VVVV(b,a)*z(i,b) &
+ yV(a,b)*z(i,b)
end do
end do
end do
! Check convergence
Conv = maxval(abs(r(:,:)))
! Update amplitudes
z(:,:) = z(:,:) - 0.5d0*r(:,:)/delta_OV(:,:)
! DIIS extrapolation
if(max_diis > 1) then
n_diis = min(n_diis+1,max_diis)
call DIIS_extrapolation(rcond,O*V,O*V,n_diis,err_diis,z_diis,-0.5d0*r/delta_OV,z)
end if
write(*,'(1X,A1,1X,I3,1X,A1,1X,F16.10,1X,A1,1X,F10.6,1X,A1,1X,F10.6,1X,A1,1X)') &
'|',nSCF,'|',ECC+ENuc,'|',EcCC,'|',Conv,'|'
end do
write(*,*)'----------------------------------------------------'
write(*,*)
!------------------------------------------------------------------------
! End of SCF loop
!------------------------------------------------------------------------
! Did it actually converge?
if(nSCF == maxSCF) then
@ -214,6 +323,152 @@ subroutine pCCD(dotest,maxSCF,thresh,max_diis,nBas,nC,nO,nV,nR,ERI,ENuc,ERHF,eHF
end if
! Deallocate memory
deallocate(err_diis,z_diis,r)
!--------------------------!
! Compute density matrices !
!--------------------------!
allocate(xOO(O,O),xVV(V,V),xOV(O,V))
xOO(:,:) = matmul(t,transpose(z))
xVV(:,:) = matmul(transpose(z),t)
xOV(:,:) = matmul(t,matmul(transpose(z),t))
! Form 1RDM
allocate(rdm1(O+V,O+V))
rdm1(:,:) = 0d0
do i=1,O
rdm1(i,i) = 2d0*(1d0 - xOO(i,i))
end do
do a=1,V
rdm1(O+a,O+a) = 2d0*xVV(a,a)
end do
! Check 1RDM
tr_1rdm = trace_matrix(O+V,rdm1)
write(*,*) ' --> Trace of the 1RDM = ',tr_1rdm
if( abs(dble(2*O) - tr_1rdm) > thresh ) &
write(*,*) ' !!! Your 1RDM seems broken !!! '
write(*,*)
! Form 2RM
allocate(rdm2(O+V,O+V,O+V,O+V))
rdm2(:,:,:,:) = 0d0
! iijj
do i=1,O
do j=1,O
rdm2(i,i,j,j) = 2d0*xOO(i,j)
end do
end do
! iiaa
do i=1,O
do a=1,V
rdm2(i,i,O+a,O+a) = 2d0*(t(i,a) + xOV(i,a) - 2d0*t(i,a)*(xVV(a,a) + xOO(i,i) - t(i,a)*z(i,a)))
end do
end do
! aaii
do i=1,O
do a=1,V
rdm2(O+a,O+a,i,i) = 2d0*z(a,i)
end do
end do
! aabb
do a=1,V
do b=1,V
rdm2(O+a,O+a,O+b,O+b) = 2d0*xVV(a,b)
end do
end do
! ijij
do i=1,O
do j=1,O
rdm2(i,j,i,j) = 4d0*(1d0 - xOO(i,i) - xOO(j,j))
end do
end do
! ijji
do i=1,O
do j=1,O
rdm2(i,j,j,i) = - 2d0*(1d0 - xOO(i,i) - xOO(j,j))
end do
end do
! iiii
do i=1,O
rdm2(i,i,i,i) = 2d0*(1d0 - xOO(i,i))
end do
! iaia
do i=1,O
do a=1,V
rdm2(i,O+a,i,O+a) = 4d0*(xVV(a,a) - t(i,a)*z(i,a))
end do
end do
! iaai
do i=1,O
do a=1,V
rdm2(i,O+a,O+a,i) = - 2d0*(xVV(a,a) - t(i,a)*z(i,a))
end do
end do
! aiai
do i=1,O
do a=1,V
rdm2(O+a,i,O+a,i) = 4d0*(xVV(a,a) - t(i,a)*z(i,a))
end do
end do
! aiia
do i=1,O
do a=1,V
rdm2(O+a,i,i,O+a) = - 2d0*(xVV(a,a) - t(i,a)*z(i,a))
end do
end do
! abab
do a=1,V
rdm2(O+a,O+a,O+a,O+a) = 2d0*xVV(a,a)
end do
! Check 2RDM
tr_2rdm = trace_matrix((O+V)**2,rdm2)
write(*,*) ' --> Trace of the 2RDM = ',tr_2rdm
if( abs(dble(2*O*(2*O-1)) - tr_2rdm) > thresh ) &
write(*,*) ' !!! Your 2RDM seems broken !!! '
write(*,*)
! Testing zone
if(dotest) then
call dump_test_value('R','pCCD correlation energy',EcCC)