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/* Copyright (c) 2008-2022 the MRtrix3 contributors.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* Covered Software is provided under this License on an "as is"
* basis, without warranty of any kind, either expressed, implied, or
* statutory, including, without limitation, warranties that the
* Covered Software is free of defects, merchantable, fit for a
* particular purpose or non-infringing.
* See the Mozilla Public License v. 2.0 for more details.
*
* For more details, see http://www.mrtrix.org/.
*/
#ifndef __algo_stochastic_threaded_loop_h__
#define __algo_stochastic_threaded_loop_h__
#include "debug.h"
#include "algo/loop.h"
#include "algo/iterator.h"
#include "thread.h"
#include "math/rng.h"
namespace MR
{
/* slower than ThreadedLoop for any voxel_density */
namespace {
template <int N, class Functor, class... ImageType>
struct StochasticThreadedLoopRunInner
{ MEMALIGN(StochasticThreadedLoopRunInner<N,Functor,ImageType...>)
const vector<size_t>& outer_axes;
decltype (Loop (outer_axes)) loop;
typename std::remove_reference<Functor>::type func;
double density;
Math::RNG::Uniform<double> rng;
std::tuple<ImageType...> vox;
StochasticThreadedLoopRunInner (const vector<size_t>& outer_axes, const vector<size_t>& inner_axes,
const Functor& functor, const double voxel_density, ImageType&... voxels) :
outer_axes (outer_axes),
loop (Loop (inner_axes)),
func (functor),
density (voxel_density),
rng (Math::RNG::Uniform<double>()),
vox (voxels...) { }
void operator() (const Iterator& pos) {
assign_pos_of (pos, outer_axes).to (vox);
for (auto i = unpack (loop, vox); i; ++i) {
if (rng() >= density){
//DEBUG (str(pos) + " ...skipped inner");
continue;
}
// DEBUG (str(pos) + " ...used inner");
unpack (func, vox);
}
}
};
template <class Functor, class... ImageType>
struct StochasticThreadedLoopRunInner<0,Functor,ImageType...>
{ MEMALIGN(StochasticThreadedLoopRunInner<0, Functor,ImageType...>)
const vector<size_t>& outer_axes;
decltype (Loop (outer_axes)) loop;
typename std::remove_reference<Functor>::type func;
double density;
Math::RNG::Uniform<double> rng;
StochasticThreadedLoopRunInner (const vector<size_t>& outer_axes, const vector<size_t>& inner_axes,
const Functor& functor, const double voxel_density, ImageType&... voxels) :
outer_axes (outer_axes),
loop (Loop (inner_axes)),
func (functor),
density (voxel_density),
rng (Math::RNG::Uniform<double>()) { }
void operator() (Iterator& pos) {
for (auto i = loop (pos); i; ++i){
if (rng() >= density){
// DEBUG (str(pos) + " ...skipped inner");
continue;
}
// DEBUG (str(pos) + " ...used inner");
func (pos);
}
}
};
template <class OuterLoopType>
struct StochasticThreadedLoopRunOuter { MEMALIGN(StochasticThreadedLoopRunOuter<OuterLoopType>)
Iterator iterator;
OuterLoopType outer_loop;
vector<size_t> inner_axes;
//! invoke \a functor (const Iterator& pos) per voxel <em> in the outer axes only</em>
template <class Functor>
void run_outer (Functor&& functor, const double voxel_density)
{
if (Thread::threads_to_execute() == 0) {
for (auto i = outer_loop (iterator); i; ++i){
// std::cerr << "outer: " << str(iterator) << " " << voxel_density << std::endl;
functor (iterator);
}
return;
}
struct Shared { MEMALIGN(Shared)
Iterator& iterator;
decltype (outer_loop (iterator)) loop;
std::mutex mutex;
FORCE_INLINE bool next (Iterator& pos) {
std::lock_guard<std::mutex> lock (mutex);
if (loop) {
assign_pos_of (iterator, loop.axes).to (pos);
++loop;
return true;
}
else return false;
}
} shared = { iterator, outer_loop (iterator) };
struct PerThread { MEMALIGN(PerThread)
Shared& shared;
typename std::remove_reference<Functor>::type func;
void execute () {
Iterator pos = shared.iterator;
while (shared.next (pos))
func (pos);
}
} loop_thread = { shared, functor };
Thread::run (Thread::multi (loop_thread), "loop threads").wait();
}
//! invoke \a functor (const Iterator& pos) per voxel <em> in the outer axes only</em>
template <class Functor, class... ImageType>
void run (Functor&& functor, const double voxel_density, ImageType&&... vox)
{
StochasticThreadedLoopRunInner<
sizeof...(ImageType),
typename std::remove_reference<Functor>::type,
typename std::remove_reference<ImageType>::type...
> loop_thread (outer_loop.axes, inner_axes, functor, voxel_density, vox...);
run_outer (loop_thread, voxel_density);
check_app_exit_code();
}
};
}
template <class HeaderType>
inline StochasticThreadedLoopRunOuter<decltype(Loop(vector<size_t>()))> StochasticThreadedLoop (
const HeaderType& source,
const vector<size_t>& outer_axes,
const vector<size_t>& inner_axes) {
return { source, Loop (outer_axes), inner_axes };
}
template <class HeaderType>
inline StochasticThreadedLoopRunOuter<decltype(Loop(vector<size_t>()))> StochasticThreadedLoop (
const HeaderType& source,
const vector<size_t>& axes,
size_t num_inner_axes = 1) {
return { source, Loop (get_outer_axes (axes, num_inner_axes)), get_inner_axes (axes, num_inner_axes) };
}
template <class HeaderType>
inline StochasticThreadedLoopRunOuter<decltype(Loop(vector<size_t>()))> StochasticThreadedLoop (
const HeaderType& source,
size_t from_axis = 0,
size_t to_axis = std::numeric_limits<size_t>::max(),
size_t num_inner_axes = 1) {
return { source,
Loop (get_outer_axes (source, num_inner_axes, from_axis, to_axis)),
get_inner_axes (source, num_inner_axes, from_axis, to_axis) };
}
template <class HeaderType>
inline StochasticThreadedLoopRunOuter<decltype(Loop("", vector<size_t>()))> StochasticThreadedLoop (
const std::string& progress_message,
const HeaderType& source,
const vector<size_t>& outer_axes,
const vector<size_t>& inner_axes) {
return { source, Loop (progress_message, outer_axes), inner_axes };
}
template <class HeaderType>
inline StochasticThreadedLoopRunOuter<decltype(Loop("", vector<size_t>()))> StochasticThreadedLoop (
const std::string& progress_message,
const HeaderType& source,
const vector<size_t>& axes,
size_t num_inner_axes = 1) {
return { source,
Loop (progress_message, get_outer_axes (axes, num_inner_axes)),
get_inner_axes (axes, num_inner_axes) };
}
template <class HeaderType>
inline StochasticThreadedLoopRunOuter<decltype(Loop("", vector<size_t>()))> StochasticThreadedLoop (
const std::string& progress_message,
const HeaderType& source,
size_t from_axis = 0,
size_t to_axis = std::numeric_limits<size_t>::max(),
size_t num_inner_axes = 1) {
return { source,
Loop (progress_message, get_outer_axes (source, num_inner_axes, from_axis, to_axis)),
get_inner_axes (source, num_inner_axes, from_axis, to_axis) };
}
/*! \} */
}
#endif
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