mirror of
https://github.com/NGSolve/netgen.git
synced 2024-12-25 05:20:34 +05:00
395 lines
13 KiB
C++
395 lines
13 KiB
C++
#ifndef NETGEN_CORE_PYTHON_NGCORE_HPP
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#define NETGEN_CORE_PYTHON_NGCORE_HPP
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#include "ngcore_api.hpp" // for operator new
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#include <pybind11/pybind11.h>
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#include <pybind11/operators.h>
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#include <pybind11/numpy.h>
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#include <pybind11/stl.h>
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#include "array.hpp"
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#include "table.hpp"
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#include "archive.hpp"
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#include "flags.hpp"
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#include "ngcore_api.hpp"
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#include "profiler.hpp"
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namespace py = pybind11;
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////////////////////////////////////////////////////////////////////////////////
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// automatic conversion of python list to Array<>
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namespace pybind11 {
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namespace detail {
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template <typename Type, typename Value> struct ngcore_list_caster {
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using value_conv = make_caster<Value>;
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bool load(handle src, bool convert) {
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if (!isinstance<sequence>(src) || isinstance<str>(src))
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return false;
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auto s = reinterpret_borrow<sequence>(src);
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value.SetSize(s.size());
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value.SetSize0();
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for (auto it : s) {
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value_conv conv;
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if (!conv.load(it, convert))
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return false;
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value.Append(cast_op<Value &&>(std::move(conv)));
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}
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return true;
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}
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public:
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template <typename T>
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static handle cast(T &&src, return_value_policy policy, handle parent) {
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if (!std::is_lvalue_reference<T>::value)
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policy = return_value_policy_override<Value>::policy(policy);
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list l(src.Size());
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size_t index = 0;
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for (auto &&value : src) {
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auto value_ = reinterpret_steal<object>(value_conv::cast(forward_like<T>(value), policy, parent));
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if (!value_)
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return handle();
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PyList_SET_ITEM(l.ptr(), (ssize_t) index++, value_.release().ptr()); // steals a reference
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}
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return l.release();
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}
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PYBIND11_TYPE_CASTER(Type, _("Array[") + value_conv::name + _("]"));
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};
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template <typename Type> struct type_caster<ngcore::Array<Type>>
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: ngcore_list_caster<ngcore::Array<Type>, Type> { };
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/*
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template <typename Type> struct type_caster<std::shared_ptr<ngcore::Table<Type>>>
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{
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template <typename T>
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static handle cast(T &&src, return_value_policy policy, handle parent)
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{
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std::cout << "handle called with type src = " << typeid(src).name() << std::endl;
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return handle(); // what so ever
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}
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PYBIND11_TYPE_CASTER(Type, _("Table[") + make_caster<Type>::name + _("]"));
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};
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*/
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} // namespace detail
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} // namespace pybind11
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////////////////////////////////////////////////////////////////////////////////
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namespace ngcore
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{
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NGCORE_API extern bool ngcore_have_numpy;
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NGCORE_API extern bool parallel_pickling;
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// Python class name type traits
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template <typename T>
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struct PyNameTraits {
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static const std::string & GetName()
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{
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static const std::string name = typeid(T).name();
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return name;
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}
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};
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template <typename T>
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std::string GetPyName(const char *prefix = 0) {
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std::string s;
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if(prefix) s = std::string(prefix);
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s+= PyNameTraits<T>::GetName();
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return s;
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}
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template<>
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struct PyNameTraits<int> {
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static std::string GetName() { return "I"; }
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};
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template<>
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struct PyNameTraits<unsigned> {
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static std::string GetName() { return "U"; }
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};
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template<>
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struct PyNameTraits<float> {
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static std::string GetName() { return "F"; }
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};
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template<>
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struct PyNameTraits<double> {
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static std::string GetName() { return "D"; }
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};
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template<>
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struct PyNameTraits<size_t> {
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static std::string GetName() { return "S"; }
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};
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template<typename T>
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struct PyNameTraits<std::shared_ptr<T>> {
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static std::string GetName()
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{ return std::string("sp_")+GetPyName<T>(); }
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};
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template<typename T>
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Array<T> makeCArray(const py::object& obj)
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{
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Array<T> arr;
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if(py::isinstance<py::list>(obj))
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for(auto& val : py::cast<py::list>(obj))
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arr.Append(py::cast<T>(val));
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else if(py::isinstance<py::tuple>(obj))
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for(auto& val : py::cast<py::tuple>(obj))
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arr.Append(py::cast<T>(val));
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else
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throw py::type_error("Cannot convert Python object to C Array");
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return arr;
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}
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namespace detail
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{
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template<typename T>
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struct HasPyFormat
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{
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private:
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template<typename T2>
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static auto check(T2*) -> std::enable_if_t<std::is_same_v<decltype(std::declval<py::format_descriptor<T2>>().format()), std::string>, std::true_type>;
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static auto check(...) -> std::false_type;
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public:
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static constexpr bool value = decltype(check((T*) nullptr))::value;
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};
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} // namespace detail
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template <typename T, typename TIND=typename FlatArray<T>::index_type>
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void ExportArray (py::module &m)
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{
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using TFlat = FlatArray<T, TIND>;
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using TArray = Array<T, TIND>;
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std::string suffix = GetPyName<T>() + "_" +
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GetPyName<TIND>();
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std::string fname = std::string("FlatArray_") + suffix;
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auto flatarray_class = py::class_<TFlat>(m, fname.c_str(),
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py::buffer_protocol())
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.def ("__len__", [] ( TFlat &self ) { return self.Size(); } )
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.def ("__getitem__",
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[](TFlat & self, TIND i) -> T&
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{
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static constexpr int base = IndexBASE<TIND>();
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if (i < base || i >= self.Size()+base)
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throw py::index_error();
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return self[i];
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},
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py::return_value_policy::reference)
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.def ("__setitem__",
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[](TFlat & self, TIND i, T val) -> T&
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{
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static constexpr int base = IndexBASE<TIND>();
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if (i < base || i >= self.Size()+base)
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throw py::index_error();
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self[i] = val;
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return self[i];
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},
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py::return_value_policy::reference)
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.def ("__setitem__",
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[](TFlat & self, py::slice slice, T val)
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{
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size_t start, stop, step, slicelength;
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if (!slice.compute(self.Size(), &start, &stop, &step, &slicelength))
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throw py::error_already_set();
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static constexpr int base = IndexBASE<TIND>();
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if (start < base || start+(slicelength-1)*step >= self.Size()+base)
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throw py::index_error();
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for (size_t i = 0; i < slicelength; i++, start+=step)
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self[start] = val;
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})
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.def("__iter__", [] ( TFlat & self) {
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return py::make_iterator (self.begin(),self.end());
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}, py::keep_alive<0,1>()) // keep array alive while iterator is used
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.def("__str__", [](TFlat& self)
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{
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return ToString(self);
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})
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;
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if constexpr (detail::HasPyFormat<T>::value)
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{
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if(ngcore_have_numpy && !py::detail::npy_format_descriptor<T>::dtype().is_none())
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{
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flatarray_class
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.def_buffer([](TFlat& self)
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{
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return py::buffer_info(
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self.Addr(0),
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sizeof(T),
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py::format_descriptor<T>::format(),
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1,
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{ self.Size() },
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{ sizeof(T) * (self.Addr(1) - self.Addr(0)) });
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})
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.def("NumPy", [](py::object self)
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{
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return py::module::import("numpy")
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.attr("frombuffer")(self, py::detail::npy_format_descriptor<T>::dtype());
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})
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;
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}
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}
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std::string aname = std::string("Array_") + suffix;
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py::class_<TArray, TFlat>(m, aname.c_str())
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.def(py::init([] (size_t n) { return new TArray(n); }),py::arg("n"), "Makes array of given length")
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.def(py::init([] (std::vector<T> const & x)
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{
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size_t s = x.size();
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TArray tmp(s);
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for (size_t i : Range(tmp))
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tmp[TIND(i)] = x[i];
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return tmp;
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}), py::arg("vec"), "Makes array with given list of elements")
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;
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}
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template <typename T>
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void ExportTable (py::module &m)
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{
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py::class_<ngcore::Table<T>, std::shared_ptr<ngcore::Table<T>>> (m, ("Table+"+GetPyName<T>()).c_str())
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;
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}
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void NGCORE_API SetFlag(Flags &flags, std::string s, py::object value);
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// Parse python kwargs to flags
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Flags NGCORE_API CreateFlagsFromKwArgs(const py::kwargs& kwargs, py::object pyclass = py::none(),
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py::list info = py::list());
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// Create python dict from kwargs
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py::dict NGCORE_API CreateDictFromFlags(const Flags& flags);
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// *************** Archiving functionality **************
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template<typename T>
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Archive& Archive :: Shallow(T& val)
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{
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static_assert(detail::is_any_pointer<T>, "ShallowArchive must be given pointer type!");
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#ifdef NETGEN_PYTHON
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if(shallow_to_python)
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{
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if(is_output)
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ShallowOutPython(pybind11::cast(val));
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else
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{
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pybind11::object obj;
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ShallowInPython(obj);
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val = pybind11::cast<T>(obj);
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}
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}
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else
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#endif // NETGEN_PYTHON
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*this & val;
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return *this;
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}
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template<typename ARCHIVE>
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class NGCORE_API_EXPORT PyArchive : public ARCHIVE
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{
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private:
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pybind11::list lst;
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size_t index = 0;
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std::map<std::string, VersionInfo> version_needed;
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protected:
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using ARCHIVE::stream;
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using ARCHIVE::version_map;
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using ARCHIVE::logger;
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public:
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PyArchive(const pybind11::object& alst = pybind11::none()) :
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ARCHIVE(std::make_shared<std::stringstream>()),
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lst(alst.is_none() ? pybind11::list() : pybind11::cast<pybind11::list>(alst))
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{
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ARCHIVE::shallow_to_python = true;
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if(Input())
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{
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stream = std::make_shared<std::stringstream>
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(pybind11::cast<pybind11::bytes>(lst[pybind11::len(lst)-1]));
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*this & version_needed;
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logger->debug("versions needed for unpickling = {}", version_needed);
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for(auto& libversion : version_needed)
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if(libversion.second > GetLibraryVersion(libversion.first))
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throw Exception("Error in unpickling data:\nLibrary " + libversion.first +
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" must be at least " + libversion.second.to_string());
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stream = std::make_shared<std::stringstream>
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(pybind11::cast<pybind11::bytes>(lst[pybind11::len(lst)-2]));
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*this & version_map;
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stream = std::make_shared<std::stringstream>
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(pybind11::cast<pybind11::bytes>(lst[pybind11::len(lst)-3]));
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}
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}
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void NeedsVersion(const std::string& library, const std::string& version) override
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{
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if(Output())
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{
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logger->debug("Need version {} of library {}.", version, library);
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version_needed[library] = version_needed[library] > version ? version_needed[library] : version;
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}
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}
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using ARCHIVE::Output;
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using ARCHIVE::Input;
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using ARCHIVE::FlushBuffer;
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using ARCHIVE::operator&;
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using ARCHIVE::operator<<;
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using ARCHIVE::GetVersion;
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void ShallowOutPython(const pybind11::object& val) override { lst.append(val); }
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void ShallowInPython(pybind11::object& val) override { val = lst[index++]; }
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pybind11::list WriteOut()
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{
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auto version_runtime = GetLibraryVersions();
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FlushBuffer();
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lst.append(pybind11::bytes(std::static_pointer_cast<std::stringstream>(stream)->str()));
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stream = std::make_shared<std::stringstream>();
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*this & version_runtime;
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FlushBuffer();
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lst.append(pybind11::bytes(std::static_pointer_cast<std::stringstream>(stream)->str()));
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stream = std::make_shared<std::stringstream>();
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logger->debug("Writeout version needed = {}", version_needed);
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*this & version_needed;
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FlushBuffer();
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lst.append(pybind11::bytes(std::static_pointer_cast<std::stringstream>(stream)->str()));
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return lst;
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}
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};
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template<typename T, typename T_ARCHIVE_OUT=BinaryOutArchive, typename T_ARCHIVE_IN=BinaryInArchive>
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auto NGSPickle()
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{
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return pybind11::pickle([](T* self)
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{
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PyArchive<T_ARCHIVE_OUT> ar;
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ar.SetParallel(parallel_pickling);
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ar & self;
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auto output = pybind11::make_tuple(ar.WriteOut());
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return output;
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},
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[](const pybind11::tuple & state)
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{
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T* val = nullptr;
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PyArchive<T_ARCHIVE_IN> ar(state[0]);
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ar & val;
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return val;
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});
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}
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} // namespace ngcore
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#endif // NETGEN_CORE_PYTHON_NGCORE_HPP
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