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Added threshold function. Tests still dont compile. #25

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vijay gopal chilkuri 2021-07-20 10:51:21 +02:00
parent 6e047046f4
commit dcb4816941
1 changed files with 118 additions and 16 deletions
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134
org/qmckl_sherman_morrison_woodbury.org
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@ -28,6 +28,120 @@ int main() {
context = qmckl_context_create();
#+end_src
* Sherman-Morrison Helper Functions
[TODO: FMJC] Add doc
** ~qmckl_sherman_morrison_threshold~
:PROPERTIES:
:Name: qmckl_sherman_morrison_threshold
:CRetType: double
:FRetType: double precision
:END:
[TODO: FMJC] Add doc
#+NAME: qmckl_sherman_morrison_threshold_args
| double | thresh | out | Threshold |
*** Requirements
Add description of the input variables. (see for e.g. qmckl_distance.org)
*** C header
#+CALL: generate_c_header(table=qmckl_sherman_morrison_threshold_args,rettyp=get_value("CRetType"),fname=get_value("Name"))
#+RESULTS:
#+begin_src c :tangle (eval h_func) :comments org
// Sherman-Morrison-Woodbury break-down threshold
#ifndef THRESHOLD
#define THRESHOLD 1e-3
#endif
qmckl_exit_code qmckl_sherman_morrison_threshold (
double* const thresh );
#+end_src
*** Source Fortran
#+begin_src f90 :tangle (eval f)
integer function qmckl_sherman_morrison_threshold_f(thresh) result(info)
use qmckl
implicit none
real*8 , intent(inout) :: thresh
!logical, external :: qmckl_sherman_morrison_f
info = qmckl_sherman_morrison_threshold(thresh)
end function qmckl_sherman_morrison_threshold_f
#+end_src
*** Source C
#+begin_src c :tangle (eval c) :comments org
#include <stdbool.h>
#include <math.h>
#include "qmckl.h"
// Sherman-Morrison-Woodbury break-down threshold
static double qmckl_shreman_morrison_threshold(double* const threshold) {
*threshold = THRESHOLD;
#ifdef DEBUG
std::cerr << "Break-down threshold set to: " << threshold << std::endl;
#endif
}
#+end_src
*** Performance
** C interface :noexport:
#+CALL: generate_c_interface(table=qmckl_sherman_morrison_threshold_args,rettyp=get_value("FRetType"),fname=get_value("Name"))
#+RESULTS:
#+begin_src f90 :tangle (eval f) :comments org :exports none
integer(c_int32_t) function qmckl_sherman_morrison_threshold &
(thresh) &
bind(C) result(info)
use, intrinsic :: iso_c_binding
implicit none
real (c_double ) , intent(out) :: thresh
integer(c_int32_t), external :: qmckl_sherman_morrison_threshold_f
info = qmckl_sherman_morrison_threshold_f &
(thresh)
end function qmckl_sherman_morrison_threshold
#+end_src
#+CALL: generate_f_interface(table=qmckl_sherman_morrison_threshold_args,rettyp=get_value("FRetType"),fname=get_value("Name"))
#+RESULTS:
#+begin_src f90 :tangle (eval fh_func) :comments org :exports none
interface
integer(c_int32_t) function qmckl_sherman_morrison_threshold &
(thresh) &
bind(C)
use, intrinsic :: iso_c_binding
import
implicit none
real (c_double ) , intent(out) :: thresh
end function qmckl_sherman_morrison_threshold
end interface
#+end_src
*** Test :noexport:
[TODO: FMJC] Write tests for the Sherman-Morrison part.
* Naïve Sherman-Morrison
@ -64,12 +178,6 @@ int main() {
#+RESULTS:
#+begin_src c :tangle (eval h_func) :comments org
// Sherman-Morrison-Woodbury break-down threshold
#ifndef THRESHOLD
#define THRESHOLD 1e-3
#endif
static double threshold();
qmckl_exit_code qmckl_sherman_morrison_c (
const qmckl_context context,
const uint64_t Dim,
@ -102,15 +210,6 @@ end function qmckl_sherman_morrison_f
#include <stdbool.h>
#include "qmckl.h"
// Sherman-Morrison-Woodbury break-down threshold
static double threshold() {
const double threshold = THRESHOLD;
#ifdef DEBUG
std::cerr << "Break-down threshold set to: " << threshold << std::endl;
#endif
return threshold;
}
qmckl_exit_code qmckl_sherman_morrison_c(const qmckl_context context,
const uint64_t Dim,
const uint64_t N_updates,
@ -124,6 +223,9 @@ qmckl_exit_code qmckl_sherman_morrison_c(const qmckl_context context,
double C[Dim];
double D[Dim];
double threshold = 0.0;
qmckl_sherman_morrison_threshold(&threshold);
unsigned int l = 0;
// For each update
while (l < N_updates) {
@ -137,7 +239,7 @@ qmckl_exit_code qmckl_sherman_morrison_c(const qmckl_context context,
// Denominator
double den = 1 + C[Updates_index[l] - 1];
if (fabs(den) < threshold()) {
if (fabs(den) < threshold) {
return false;
}
double iden = 1 / den;