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https://github.com/LCPQ/quantum_package
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132 lines
4.3 KiB
Fortran
132 lines
4.3 KiB
Fortran
subroutine fill_H_apply_buffer_selection(n_selected,det_buffer,e_2_pert_buffer,coef_pert_buffer, &
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N_st,Nint,iproc,select_max_out)
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use bitmasks
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implicit none
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BEGIN_DOC
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! Fill the H_apply buffer with determiants for the selection
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END_DOC
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integer, intent(in) :: n_selected, Nint, N_st, iproc
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integer(bit_kind), intent(in) :: det_buffer(Nint,2,n_selected)
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double precision, intent(in) :: e_2_pert_buffer(N_st,n_selected)
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double precision, intent(in) :: coef_pert_buffer(N_st,n_selected)
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double precision, intent(inout):: select_max_out
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integer :: i,j,k,l
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integer :: new_size
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double precision :: s, smin, smax
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logical :: is_selected
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PROVIDE H_apply_buffer_allocated N_int
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ASSERT (Nint > 0)
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ASSERT (N_int == N_int)
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ASSERT (N_selected >= 0)
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call omp_set_lock(H_apply_buffer_lock(1,iproc))
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new_size = H_apply_buffer(iproc)%N_det + n_selected
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if (new_size > h_apply_buffer(iproc)%sze) then
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call resize_h_apply_buffer(max(h_apply_buffer(iproc)%sze*2,new_size),iproc)
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endif
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do i=1,H_apply_buffer(iproc)%N_det
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ASSERT (sum(popcnt(h_apply_buffer(iproc)%det(:,1,i)) )== elec_alpha_num)
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ASSERT (sum(popcnt(h_apply_buffer(iproc)%det(:,2,i))) == elec_beta_num)
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enddo
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l=H_apply_buffer(iproc)%N_det
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do i=1,n_selected
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is_selected = .False.
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do j=1,N_st
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s = dabs(e_2_pert_buffer(j,i))
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is_selected = s > selection_criterion*selection_criterion_factor .or. is_selected
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select_max_out = max(select_max_out,s)
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enddo
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if (is_selected) then
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l = l+1
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do j=1,N_int
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h_apply_buffer(iproc)%det(j,1,l) = det_buffer(j,1,i)
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h_apply_buffer(iproc)%det(j,2,l) = det_buffer(j,2,i)
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enddo
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do j=1,N_st
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H_apply_buffer(iproc)%e2(l,j) = e_2_pert_buffer(j,i)
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H_apply_buffer(iproc)%coef(l,j) = coef_pert_buffer(j,i)
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enddo
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ASSERT (sum(popcnt(h_apply_buffer(iproc)%det(:,1,l)) )== elec_alpha_num)
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ASSERT (sum(popcnt(h_apply_buffer(iproc)%det(:,2,l))) == elec_beta_num)
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endif
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enddo
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H_apply_buffer(iproc)%N_det = l
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do i=1,H_apply_buffer(iproc)%N_det
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ASSERT (sum(popcnt(h_apply_buffer(iproc)%det(:,1,i)) )== elec_alpha_num)
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ASSERT (sum(popcnt(h_apply_buffer(iproc)%det(:,2,i))) == elec_beta_num)
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enddo
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call omp_unset_lock(H_apply_buffer_lock(1,iproc))
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end
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BEGIN_PROVIDER [ double precision, selection_criterion ]
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&BEGIN_PROVIDER [ double precision, selection_criterion_min ]
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&BEGIN_PROVIDER [ double precision, selection_criterion_factor ]
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implicit none
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BEGIN_DOC
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! Threshold to select determinants. Set by selection routines.
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END_DOC
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selection_criterion = 0.1d0
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selection_criterion_factor = 0.01d0
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selection_criterion_min = selection_criterion
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END_PROVIDER
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subroutine remove_small_contributions
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implicit none
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BEGIN_DOC
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! Remove determinants with small contributions. N_states is assumed to be
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! provided.
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END_DOC
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integer :: i,j,k, N_removed
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logical, allocatable :: keep(:)
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double precision :: i_H_psi_array(N_states)
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allocate (keep(N_det))
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call diagonalize_CI
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do i=1,N_det
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keep(i) = .True.
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enddo
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!$OMP PARALLEL DEFAULT(NONE) &
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!$OMP PRIVATE(i,j,i_H_psi_array) &
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!$OMP SHARED(k,psi_det_sorted,psi_coef_sorted,N_int,N_det,psi_det_size,N_states, &
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!$OMP selection_criterion_min,keep,N_det_generators) &
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!$OMP REDUCTION(+:N_removed)
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!$OMP DO
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do i=2*N_det_generators+1, N_det
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call i_H_psi(psi_det_sorted(1,1,i),psi_det_sorted,psi_coef_sorted,N_int,min(N_det,2*N_det_generators),psi_det_size,N_states,i_H_psi_array)
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keep(i) = .False.
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do j=1,N_states
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keep(i) = keep(i) .or. (-(psi_coef_sorted(i,j)*i_H_psi_array(j)) > selection_criterion_min)
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enddo
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enddo
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!$OMP END DO
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!$OMP END PARALLEL
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N_removed = 0
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k = 0
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do i=1, N_det
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PROVIDE psi_coef psi_det psi_det_sorted psi_coef_sorted
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if (keep(i)) then
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k += 1
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do j=1,N_int
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psi_det(j,1,k) = psi_det_sorted(j,1,i)
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psi_det(j,2,k) = psi_det_sorted(j,2,i)
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enddo
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do j=1,N_states
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psi_coef(k,j) = psi_coef_sorted(i,j)
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enddo
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else
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N_removed += 1
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endif
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enddo
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deallocate(keep)
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if (N_removed > 0) then
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N_det = N_det - N_removed
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SOFT_TOUCH N_det psi_det psi_coef
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call write_int(output_determinants,N_removed, 'Removed determinants')
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endif
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end
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