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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"
#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 Engine = FFTWEngine<DimS, DimM>;
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())
.def(py::init([](Ccoord res, Rcoord lengths) {
auto engine = std::make_unique<Engine>(res, lengths);
return Proj(std::move(engine));
}))
.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 Engine::GFieldCollection_t coll{};
coll.initialise(proj.get_resolutions());
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");
}
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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