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muSpectre/language_bindings/python/bind_py_projections.cc
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bind_py_projections.cc
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/**
* @file bind_py_projections.cc
*
* @author Till Junge <till.junge@altermail.ch>
*
* @date 18 Jan 2018
*
* @brief Python bindings for the Projection operators
*
* Copyright © 2018 Till Junge
*
* µSpectre is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3, or (at
* your option) any later version.
*
* µSpectre is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Emacs; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "fft/projection_small_strain.hh"
#include "fft/projection_finite_strain.hh"
#include "fft/projection_finite_strain_fast.hh"
#include "fft/fftw_engine.hh"
#ifdef WITH_FFTWMPI
#include "fft/fftwmpi_engine.hh"
#endif
#ifdef WITH_PFFT
#include "fft/pfft_engine.hh"
#endif
#include <pybind11/pybind11.h>
#include <pybind11/stl.h>
#include <pybind11/eigen.h>
#include <sstream>
#include <memory>
using namespace muSpectre;
namespace py=pybind11;
using namespace pybind11::literals;
/**
* "Trampoline" class for handling the pure virtual methods, see
* [http://pybind11.readthedocs.io/en/stable/advanced/classes.html#overriding-virtual-functions-in-python]
* for details
*/
template <Dim_t DimS, Dim_t DimM>
class PyProjectionBase: public ProjectionBase<DimS, DimM> {
public:
//! base class
using Parent = ProjectionBase<DimS, DimM>;
//! field type on which projection is applied
using Field_t = typename Parent::Field_t;
void apply_projection(Field_t & field) override {
PYBIND11_OVERLOAD_PURE
(void,
Parent,
apply_projection,
field
);
}
Eigen::Map<Eigen::ArrayXXd> get_operator() override {
PYBIND11_OVERLOAD_PURE
(Eigen::Map<Eigen::ArrayXXd>,
Parent,
get_operator
);
}
};
template <class Proj, Dim_t DimS, Dim_t DimM=DimS>
void add_proj_helper(py::module & mod, std::string name_start) {
using Ccoord = Ccoord_t<DimS>;
using Rcoord = Rcoord_t<DimS>;
using Field_t = typename Proj::Field_t;
static_assert(DimS == DimM,
"currently only for DimS==DimM");
std::stringstream name{};
name << name_start << '_' << DimS << 'd';
py::class_<Proj>(mod, name.str().c_str())
#ifdef WITH_MPI
.def(py::init([](Ccoord res, Rcoord lengths, const std::string & fft,
size_t comm) {
if (fft == "fftw") {
auto engine = std::make_unique<FFTWEngine<DimS, DimM>>
(res, std::move(Communicator(MPI_Comm(comm))));
return Proj(std::move(engine), lengths);
}
#else
.def(py::init([](Ccoord res, Rcoord lengths, const std::string & fft) {
if (fft == "fftw") {
auto engine = std::make_unique<FFTWEngine<DimS, DimM>>(res);
return Proj(std::move(engine), lengths);
}
#endif
#ifdef WITH_FFTWMPI
else if (fft == "fftwmpi") {
auto engine = std::make_unique<FFTWMPIEngine<DimS, DimM>>
(res, std::move(Communicator(MPI_Comm(comm))));
return Proj(std::move(engine), lengths);
}
#endif
#ifdef WITH_PFFT
else if (fft == "pfft") {
auto engine = std::make_unique<PFFTEngine<DimS, DimM>>
(res, std::move(Communicator(MPI_Comm(comm))));
return Proj(std::move(engine), lengths);
}
#endif
else {
throw std::runtime_error("Unknown FFT engine '"+fft+"' specified.");
}
}),
"resolutions"_a,
"lengths"_a,
#ifdef WITH_MPI
"fft"_a="fftw",
"communicator"_a=size_t(MPI_COMM_SELF))
#else
"fft"_a="fftw")
#endif
.def("initialise", &Proj::initialise,
"flags"_a=FFT_PlanFlags::estimate,
"initialises the fft engine (plan the transform)")
.def("apply_projection",
[](Proj & proj, py::EigenDRef<Eigen::ArrayXXd> v){
typename FFTEngineBase<DimS, DimM>::GFieldCollection_t coll{};
Eigen::Index subdomain_size =
CcoordOps::get_size(proj.get_subdomain_resolutions());
if (v.rows() != DimS*DimM || v.cols() != subdomain_size) {
throw std::runtime_error("Expected input array of shape ("+
std::to_string(DimS*DimM)+", "+
std::to_string(subdomain_size)+
"), but input array has shape ("+
std::to_string(v.rows())+", "+
std::to_string(v.cols())+").");
}
coll.initialise(proj.get_subdomain_resolutions(),
proj.get_subdomain_locations());
Field_t & temp{make_field<Field_t>("temp_field", coll)};
temp.eigen() = v;
proj.apply_projection(temp);
return Eigen::ArrayXXd{temp.eigen()};
})
.def("get_operator", &Proj::get_operator)
.def("get_formulation", &Proj::get_formulation,
"return a Formulation enum indicating whether the projection is small"
" or finite strain")
.def("get_subdomain_resolutions", &Proj::get_subdomain_resolutions)
.def("get_subdomain_locations", &Proj::get_subdomain_locations)
.def("get_domain_resolutions", &Proj::get_domain_resolutions)
.def("get_domain_lengths", &Proj::get_domain_resolutions);
}
void add_proj_dispatcher(py::module & mod) {
add_proj_helper<
ProjectionSmallStrain< twoD, twoD>,
twoD>(mod, "ProjectionSmallStrain");
add_proj_helper<
ProjectionSmallStrain<threeD, threeD>,
threeD>(mod, "ProjectionSmallStrain");
add_proj_helper<
ProjectionFiniteStrain< twoD, twoD>,
twoD>(mod, "ProjectionFiniteStrain");
add_proj_helper<
ProjectionFiniteStrain<threeD, threeD>,
threeD>(mod, "ProjectionFiniteStrain");
add_proj_helper<
ProjectionFiniteStrainFast< twoD, twoD>,
twoD>(mod, "ProjectionFiniteStrainFast");
add_proj_helper<
ProjectionFiniteStrainFast<threeD, threeD>,
threeD>(mod, "ProjectionFiniteStrainFast");
}
void add_projections(py::module & mod) {
add_proj_dispatcher(mod);
}
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