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bind_py_cell.cc
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/**
* @file bind_py_cell.cc
*
* @author Till Junge <till.junge@epfl.ch>
*
* @date 09 Jan 2018
*
* @brief Python bindings for the cell factory function
*
* Copyright © 2018 Till Junge
*
* µSpectre is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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 Lesser General Public License
* along with µSpectre; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* * Boston, MA 02111-1307, USA.
*
* Additional permission under GNU GPL version 3 section 7
*
* If you modify this Program, or any covered work, by linking or combining it
* with proprietary FFT implementations or numerical libraries, containing parts
* covered by the terms of those libraries' licenses, the licensors of this
* Program grant you additional permission to convey the resulting work.
*/
#include "common/common.hh"
#include "common/ccoord_operations.hh"
#include "cell/cell_factory.hh"
#include "cell/cell_base.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;
/**
* cell factory for specific FFT engine
*/
#ifdef WITH_MPI
template <Dim_t dim, class FFTEngine>
void add_parallel_cell_factory_helper(py::module & mod,
const char *name) {
using Ccoord = Ccoord_t<dim>;
using Rcoord = Rcoord_t<dim>;
mod.def
(name,
[](Ccoord res, Rcoord lens, Formulation form, size_t comm) {
return make_parallel_cell
<dim, dim, CellBase<dim, dim>, FFTEngine>
(std::move(res), std::move(lens), std::move(form),
std::move(Communicator(MPI_Comm(comm))));
},
"resolutions"_a,
"lengths"_a=CcoordOps::get_cube<dim>(1.),
"formulation"_a=Formulation::finite_strain,
"communicator"_a=size_t(MPI_COMM_SELF));
}
#endif
/**
* the cell factory is only bound for default template parameters
*/
template <Dim_t dim>
void add_cell_factory_helper(py::module & mod) {
using Ccoord = Ccoord_t<dim>;
using Rcoord = Rcoord_t<dim>;
mod.def
("CellFactory",
[](Ccoord res, Rcoord lens, Formulation form) {
return make_cell(std::move(res), std::move(lens), std::move(form));
},
"resolutions"_a,
"lengths"_a=CcoordOps::get_cube<dim>(1.),
"formulation"_a=Formulation::finite_strain);
#ifdef WITH_FFTWMPI
add_parallel_cell_factory_helper<dim, FFTWMPIEngine<dim>>(
mod, "FFTWMPICellFactory");
#endif
#ifdef WITH_PFFT
add_parallel_cell_factory_helper<dim, PFFTEngine<dim>>(
mod, "PFFTCellFactory");
#endif
}
void add_cell_factory(py::module & mod) {
add_cell_factory_helper<twoD >(mod);
add_cell_factory_helper<threeD>(mod);
}
/**
* CellBase for which the material and spatial dimension are identical
*/
template <Dim_t dim>
void add_cell_base_helper(py::module & mod) {
std::stringstream name_stream{};
name_stream << "CellBase" << dim << 'd';
const std::string name = name_stream.str();
using sys_t = CellBase<dim, dim>;
py::class_<sys_t, Cell>(mod, name.c_str())
.def("__len__", &sys_t::size)
.def("__iter__", [](sys_t & s) {
return py::make_iterator(s.begin(), s.end());
})
.def("initialise", &sys_t::initialise, "flags"_a=FFT_PlanFlags::estimate)
.def("directional_stiffness",
[](sys_t& cell, py::EigenDRef<Eigen::ArrayXXd>& v) {
if ((size_t(v.cols()) != cell.size() ||
size_t(v.rows()) != dim*dim)) {
std::stringstream err{};
err << "need array of shape (" << dim*dim << ", "
<< cell.size() << ") but got (" << v.rows() << ", "
<< v.cols() << ").";
throw std::runtime_error(err.str());
}
if (!cell.is_initialised()) {
cell.initialise();
}
const std::string out_name{"temp output for directional stiffness"};
const std::string in_name{"temp input for directional stiffness"};
constexpr bool create_tangent{true};
auto & K = cell.get_tangent(create_tangent);
auto & input = cell.get_managed_T2_field(in_name);
auto & output = cell.get_managed_T2_field(out_name);
input.eigen() = v;
cell.directional_stiffness(K, input, output);
return output.eigen();
},
"δF"_a)
.def("project",
[](sys_t& cell, py::EigenDRef<Eigen::ArrayXXd>& v) {
if ((size_t(v.cols()) != cell.size() ||
size_t(v.rows()) != dim*dim)) {
std::stringstream err{};
err << "need array of shape (" << dim*dim << ", "
<< cell.size() << ") but got (" << v.rows() << ", "
<< v.cols() << ").";
throw std::runtime_error(err.str());
}
if (!cell.is_initialised()) {
cell.initialise();
}
const std::string in_name{"temp input for projection"};
auto & input = cell.get_managed_T2_field(in_name);
input.eigen() = v;
cell.project(input);
return input.eigen();
},
"field"_a)
.def("get_strain",[](sys_t & s) {
return Eigen::ArrayXXd(s.get_strain().eigen());
})
.def("get_stress",[](sys_t & s) {
return Eigen::ArrayXXd(s.get_stress().eigen());
})
.def_property_readonly("size", &sys_t::size)
.def("evaluate_stress_tangent",
[](sys_t& cell, py::EigenDRef<Eigen::ArrayXXd>& v ) {
if ((size_t(v.cols()) != cell.size() ||
size_t(v.rows()) != dim*dim)) {
std::stringstream err{};
err << "need array of shape (" << dim*dim << ", "
<< cell.size() << ") but got (" << v.rows() << ", "
<< v.cols() << ").";
throw std::runtime_error(err.str());
}
auto & strain{cell.get_strain()};
strain.eigen() = v;
cell.evaluate_stress_tangent(strain);
},
"strain"_a)
.def("get_projection",
&sys_t::get_projection)
.def("get_subdomain_resolutions", &sys_t::get_subdomain_resolutions)
.def("get_subdomain_locations", &sys_t::get_subdomain_locations)
.def("get_domain_resolutions", &sys_t::get_domain_resolutions)
.def("get_domain_lengths", &sys_t::get_domain_resolutions);
}
void add_cell_base(py::module & mod) {
py::class_<Cell>(mod, "Cell")
.def("get_globalised_internal_real_array",
&Cell::get_globalised_internal_real_array,
"unique_name"_a,
"Convenience function to copy local (internal) fields of "
"materials into a global field. At least one of the materials in "
"the cell needs to contain an internal field named "
"`unique_name`. If multiple materials contain such a field, they "
"all need to be of same scalar type and same number of "
"components. This does not work for split pixel cells or "
"laminate pixel cells, as they can have multiple entries for the "
"same pixel. Pixels for which no field named `unique_name` "
"exists get an array of zeros."
"\n"
"Parameters:\n"
"unique_name: fieldname to fill the global field with. At "
"least one material must have such a field, or an "
"Exception is raised.");
add_cell_base_helper<twoD> (mod);
add_cell_base_helper<threeD>(mod);
}
void add_cell(py::module & mod) {
add_cell_factory(mod);
auto cell{mod.def_submodule("cell")};
cell.doc() = "bindings for cells and cell factories";
add_cell_base(cell);
}

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