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CAS+EN OK

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This commit is contained in:
Anthony Scemama 2019-03-18 23:38:01 +01:00
parent f07dc33c73
commit e7780804bf
7 changed files with 294 additions and 176 deletions
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136
CI/CI.ml
View File

@ -385,7 +385,9 @@ let make ?(n_states=1) det_space =
let pt2 { det_space ; m_H ; m_S2 ; eigensystem ; n_states } =
let second_order_sum { det_space ; m_H ; m_S2 ; eigensystem ; n_states }
i_o1_alfa alfa_o2_i w_alfa =
let mo_basis = Ds.mo_basis det_space in
@ -400,17 +402,16 @@ let pt2 { det_space ; m_H ; m_S2 ; eigensystem ; n_states } =
)
in
(* Only the gournd state is computed here *)
let psi0, e0 = Lazy.force eigensystem in
let psi0 =
let psi0, _ = Lazy.force eigensystem in
let stream =
Ds.determinant_stream det_space
in
Array.init (Ds.size det_space) (fun i ->
Stream.next stream, psi0.{i+1,1})
in
let e0 = e0.{1} in
(*
let is_internal =
@ -445,7 +446,7 @@ let pt2 { det_space ; m_H ; m_S2 ; eigensystem ; n_states } =
let psi_filtered_idx =
let rec aux accu = function
| j when j <= i -> List.rev accu
| j when j < i -> List.rev accu
| j -> if Determinant.degree (fst psi0.(i)) (fst psi0.(j)) < 4 then
aux (j::accu) (j-1)
else
@ -457,10 +458,27 @@ let pt2 { det_space ; m_H ; m_S2 ; eigensystem ; n_states } =
List.map (fun i -> psi0.(i)) psi_filtered_idx
in
let psi_h alfa =
let hij = h_ij mo_basis alfa in
let symmetric = i_o1_alfa == alfa_o2_i in
let psi_h_alfa alfa =
List.fold_left (fun accu (det, coef) ->
accu +. coef *. (hij det)) 0. psi_filtered
accu +. coef *. (i_o1_alfa det alfa)) 0. psi_filtered
in
let alfa_h_psi =
if symmetric then
psi_h_alfa
else
fun alfa ->
List.fold_left (fun accu (det, coef) ->
accu +. coef *. (alfa_o2_i alfa det)) 0. psi_filtered
in
let psi_h_alfa_alfa_h_psi alfa =
if symmetric then
let x = psi_h_alfa alfa in x *. x
else
(psi_h_alfa alfa) *. (alfa_h_psi alfa)
in
let is_internal alfa =
@ -483,13 +501,15 @@ let pt2 { det_space ; m_H ; m_S2 ; eigensystem ; n_states } =
in
let det_i = fst psi0.(i) in
let w_alfa = w_alfa det_i in
let same_spin =
List.fold_left (fun accu spin ->
accu +.
List.fold_left (fun accu particle ->
accu +.
List.fold_left (fun accu hole ->
if hole = particle then accu else
accu +.
List.fold_left (fun accu spin ->
let alfa =
Determinant.single_excitation spin hole particle det_i
in
@ -497,39 +517,113 @@ let pt2 { det_space ; m_H ; m_S2 ; eigensystem ; n_states } =
let single =
if already_generated alfa then 0. else
let h_aa = h_ij mo_basis alfa alfa in
let psi_h_alfa = psi_h alfa in
psi_h_alfa *. psi_h_alfa /. (e0 -. h_aa)
w_alfa alfa *. psi_h_alfa_alfa_h_psi alfa
in
let double =
List.fold_left (fun accu particle' ->
if particle' > particle then
accu
else
accu +.
List.fold_left (fun accu hole' ->
accu +.
List.fold_left (fun accu spin' ->
if hole' = particle' || hole' < hole then
accu
else
let alfa =
Determinant.double_excitation
spin hole particle
spin' hole' particle' det_i
spin hole' particle' det_i
in
if Determinant.is_none alfa ||
already_generated alfa then
accu
else
let h_aa = h_ij mo_basis alfa alfa in
let psi_h_alfa = psi_h alfa in
accu +. psi_h_alfa *. psi_h_alfa /. (e0 -. h_aa)
) 0. [ Spin.Alfa ; Spin.Beta ]
accu +. w_alfa alfa *. psi_h_alfa_alfa_h_psi alfa
) 0. mo_indices
) 0. mo_indices
in
accu +. single +. double
) 0. mo_indices
) 0. mo_indices
) 0. [ Spin.Alfa ; Spin.Beta ]
in
let opposite_spin =
List.fold_left (fun accu particle ->
accu +.
List.fold_left (fun accu hole ->
if hole = particle then accu else
let alfa =
Determinant.single_excitation Spin.Alfa hole particle det_i
in
if Determinant.is_none alfa then accu else
let double =
List.fold_left (fun accu particle' ->
accu +.
List.fold_left (fun accu hole' ->
if hole' = particle' then accu else
let alfa =
Determinant.double_excitation
Spin.Alfa hole particle
Spin.Beta hole' particle' det_i
in
if Determinant.is_none alfa ||
already_generated alfa then
accu
else
accu +. w_alfa alfa *. psi_h_alfa_alfa_h_psi alfa
) 0. mo_indices
) 0. mo_indices
in
accu +. double
) 0. mo_indices
) 0. mo_indices
in
same_spin +. opposite_spin
in
Array.mapi (fun i (_,c_i) -> c_i *. det_contribution i) psi0
|> Array.fold_left (+.) 0.
let pt2_en ci =
let mo_basis = Ds.mo_basis ci.det_space in
let _psi0, e0 = Lazy.force ci.eigensystem in
let i_o1_alfa = h_ij mo_basis in
let w_alfa _ =
let e0 = e0.{1} in
let h_aa alfa = h_ij mo_basis alfa alfa in
fun alfa ->
1. /. (e0 -. h_aa alfa)
in
second_order_sum ci i_o1_alfa i_o1_alfa w_alfa
let pt2_mp ci =
let mo_basis = Ds.mo_basis ci.det_space in
let i_o1_alfa = h_ij mo_basis in
let eps = MOBasis.mo_energies mo_basis in
let w_alfa det_i alfa=
match Excitation.of_det det_i alfa with
| Excitation.Single (_, { hole ; particle ; spin })->
1./.(eps.{hole} -. eps.{particle})
| Excitation.Double (_, { hole=h ; particle=p ; spin=s },
{ hole=h'; particle=p'; spin=s'})->
1./.(eps.{h} +. eps.{h'} -. eps.{p} -. eps.{p'})
| _ -> assert false
in
second_order_sum ci i_o1_alfa i_o1_alfa w_alfa

10
CI/Excitation.ml
View File

@ -99,6 +99,16 @@ let double_of_det t t' =
| _ -> assert false
let of_det t t' =
match Determinant.degree t t' with
| 0 -> if Determinant.phase t = Determinant.phase t' then
Identity Phase.Pos
else
Identity Phase.Neg
| 1 -> single_of_det t t'
| 2 -> double_of_det t t'
| _ -> multiple_of_det t t'
let pp_s_exc ppf t =
Format.fprintf ppf "@[T^{%s}_{%d->%d}@]"
(match t.spin with

14
MOBasis/MOBasis.ml
View File

@ -40,19 +40,19 @@ let two_e_ints t = Lazy.force t.ee_ints
let one_e_ints t = Lazy.force t.one_e_ints
let mo_energies t =
let f =
let m_C = mo_coef t in
let f =
let m_N = Mat.of_diag @@ mo_occupation t in
let m_P =
gemm m_C @@ (gemm m_N m_C ~transb:`T)
in
let m_P = x_o_xt m_N m_C in
match t.mo_type with
| RHF -> Fock.make_rhf ~density:m_P (ao_basis t)
| ROHF -> Fock.make_uhf ~density_same:m_P ~density_other:m_P (ao_basis t)
| ROHF -> (Mat.scal 0.5 m_P;
Fock.make_uhf ~density_same:m_P ~density_other:m_P (ao_basis t))
| _ -> failwith "Not implemented"
in
let m_F = Fock.fock f in
Vec.init (size t) (fun i -> m_F.{i,i})
let m_F0 = Fock.fock f in
xt_o_x m_F0 m_C
|> Mat.copy_diag
let mo_matrix_of_ao_matrix ~mo_coef ao_matrix =

4
MOBasis/MOBasis.mli
View File

@ -49,6 +49,10 @@ val two_e_ints : t -> ERI.t
val size : t -> int
(** Number of molecular orbitals in the basis *)
val mo_energies : t -> Vec.t
(** Fock MO energies *)
(** {1 Creators} *)
val make : simulation:Simulation.t ->

2
Perturbation/MP2.ml
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@ -5,7 +5,7 @@ let make ?(frozen_core=true) hf =
MOBasis.of_hartree_fock hf
in
let epsilon =
HartreeFock.eigenvalues hf
MOBasis.mo_energies mo_basis
in
let mo_class =
MOClass.cas_sd mo_basis 0 0

14
SCF/HartreeFock.ml
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@ -95,8 +95,18 @@ let density t =
| _ -> failwith "Not implemented"
let occupation t =
density t
|> Mat.copy_diag ~n:(Mat.dim2 @@ eigenvectors t)
let n_alfa, n_beta =
El.n_alfa @@ Simulation.electrons @@ simulation t,
El.n_beta @@ Simulation.electrons @@ simulation t
in
match kind t with
| RHF -> Vec.init (Mat.dim2 @@ eigenvectors t) (fun i ->
if i <= nocc t then 2.0 else 0.0)
| ROHF -> Vec.init (Mat.dim2 @@ eigenvectors t) (fun i ->
if i <= n_beta then 2.0 else
if i <= n_alfa then 1.0 else
0.0)
| _ -> failwith "Not implemented"
let energy t =

2
run_cas.ml
View File

@ -72,7 +72,7 @@ let () =
let ci = CI.make space in
Format.fprintf ppf "CAS-CI energy : %20.16f@." ((CI.eigenvalues ci).{1} +. Simulation.nuclear_repulsion s);
let pt2 = CI.pt2 ci in
let pt2 = CI.pt2_en ci in
Format.fprintf ppf "CAS-EN2 energy : %20.16f@." ((CI.eigenvalues ci).{1} +. Simulation.nuclear_repulsion s +. pt2)
(*
let s2 = Util.xt_o_x ~o:(CI.s2_matrix ci) ~x:(CI.eigenvectors ci) in