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/***************************************************************************
* Copyright (c) Wolf Vollprecht, Johan Mabille and Sylvain Corlay *
* Copyright (c) QuantStack *
* *
* Distributed under the terms of the BSD 3-Clause License. *
* *
* The full license is in the file LICENSE, distributed with this software. *
****************************************************************************/
#include <numeric>
#include "xtensor/xmath.hpp"
#include "xtensor/xarray.hpp"
#define FORCE_IMPORT_ARRAY
#include "xtensor-python/pyarray.hpp"
#include "xtensor-python/pytensor.hpp"
#include "xtensor-python/pyvectorize.hpp"
#include "xtensor/xadapt.hpp"
#include "xtensor/xstrided_view.hpp"
namespace py = pybind11;
using complex_t = std::complex<double>;
// Examples
double example1(xt::pyarray<double>& m)
{
return m(0);
}
xt::pyarray<double> example2(xt::pyarray<double>& m)
{
return m + 2;
}
xt::xarray<int> example3_xarray(const xt::xarray<int>& m)
{
return xt::transpose(m) + 2;
}
xt::xarray<int, xt::layout_type::column_major> example3_xarray_colmajor(
const xt::xarray<int, xt::layout_type::column_major>& m)
{
return xt::transpose(m) + 2;
}
xt::xtensor<int, 3> example3_xtensor3(const xt::xtensor<int, 3>& m)
{
return xt::transpose(m) + 2;
}
xt::xtensor<int, 2> example3_xtensor2(const xt::xtensor<int, 2>& m)
{
return xt::transpose(m) + 2;
}
xt::xtensor<int, 2, xt::layout_type::column_major> example3_xtensor2_colmajor(
const xt::xtensor<int, 2, xt::layout_type::column_major>& m)
{
return xt::transpose(m) + 2;
}
// Readme Examples
double readme_example1(xt::pyarray<double>& m)
{
auto sines = xt::sin(m);
return std::accumulate(sines.cbegin(), sines.cend(), 0.0);
}
double readme_example2(double i, double j)
{
return std::sin(i) - std::cos(j);
}
auto complex_overload(const xt::pyarray<std::complex<double>>& a)
{
return a;
}
auto no_complex_overload(const xt::pyarray<double>& a)
{
return a;
}
auto complex_overload_reg(const std::complex<double>& a)
{
return a;
}
auto no_complex_overload_reg(const double& a)
{
return a;
}
// Vectorize Examples
int add(int i, int j)
{
return i + j;
}
template <class T> std::string typestring() { return "Unknown"; }
template <> std::string typestring<uint8_t>() { return "uint8"; }
template <> std::string typestring<int8_t>() { return "int8"; }
template <> std::string typestring<uint16_t>() { return "uint16"; }
template <> std::string typestring<int16_t>() { return "int16"; }
template <> std::string typestring<uint32_t>() { return "uint32"; }
template <> std::string typestring<int32_t>() { return "int32"; }
template <> std::string typestring<uint64_t>() { return "uint64"; }
template <> std::string typestring<int64_t>() { return "int64"; }
template <class T>
inline std::string int_overload(xt::pyarray<T>& m)
{
return typestring<T>();
}
void dump_numpy_constant()
{
std::cout << "NPY_BOOL = " << NPY_BOOL << std::endl;
std::cout << "NPY_BYTE = " << NPY_BYTE << std::endl;
std::cout << "NPY_UBYTE = " << NPY_UBYTE << std::endl;
std::cout << "NPY_INT8 = " << NPY_INT8 << std::endl;
std::cout << "NPY_UINT8 = " << NPY_UINT8 << std::endl;
std::cout << "NPY_SHORT = " << NPY_SHORT << std::endl;
std::cout << "NPY_USHORT = " << NPY_USHORT << std::endl;
std::cout << "NPY_INT16 = " << NPY_INT16 << std::endl;
std::cout << "NPY_UINT16 = " << NPY_UINT16 << std::endl;
std::cout << "NPY_INT = " << NPY_INT << std::endl;
std::cout << "NPY_UINT = " << NPY_UINT << std::endl;
std::cout << "NPY_INT32 = " << NPY_INT32 << std::endl;
std::cout << "NPY_UINT32 = " << NPY_UINT32 << std::endl;
std::cout << "NPY_LONG = " << NPY_LONG << std::endl;
std::cout << "NPY_ULONG = " << NPY_ULONG << std::endl;
std::cout << "NPY_LONGLONG = " << NPY_LONGLONG << std::endl;
std::cout << "NPY_ULONGLONG = " << NPY_ULONGLONG << std::endl;
std::cout << "NPY_INT64 = " << NPY_INT64 << std::endl;
std::cout << "NPY_UINT64 = " << NPY_UINT64 << std::endl;
}
struct A
{
double a;
int b;
char c;
std::array<double, 3> x;
};
struct B
{
double a;
int b;
};
class C
{
public:
using array_type = xt::xarray<double, xt::layout_type::row_major>;
C() : m_array{0, 0, 0, 0} {}
array_type & array() { return m_array; }
private:
array_type m_array;
};
struct test_native_casters
{
using array_type = xt::xarray<double>;
array_type a = xt::ones<double>({50, 50});
const auto & get_array()
{
return a;
}
auto get_strided_view()
{
return xt::strided_view(a, {xt::range(0, 1), xt::range(0, 3, 2)});
}
auto get_array_adapter()
{
using shape_type = std::vector<size_t>;
shape_type shape = {2, 2};
shape_type stride = {3, 2};
return xt::adapt(a.data(), 4, xt::no_ownership(), shape, stride);
}
auto get_tensor_adapter()
{
using shape_type = std::array<size_t, 2>;
shape_type shape = {2, 2};
shape_type stride = {3, 2};
return xt::adapt(a.data(), 4, xt::no_ownership(), shape, stride);
}
auto get_owning_array_adapter()
{
size_t size = 100;
int * data = new int[size];
std::fill(data, data + size, 1);
using shape_type = std::vector<size_t>;
shape_type shape = {size};
return xt::adapt(std::move(data), size, xt::acquire_ownership(), shape);
}
};
xt::pyarray<A> dtype_to_python()
{
A a1{123, 321, 'a', {1, 2, 3}};
A a2{111, 222, 'x', {5, 5, 5}};
return xt::pyarray<A>({a1, a2});
}
xt::pyarray<B> dtype_from_python(xt::pyarray<B>& b)
{
if (b(0).a != 1 || b(0).b != 'p' || b(1).a != 123 || b(1).b != 'c')
{
throw std::runtime_error("FAIL");
}
b(0).a = 123.;
b(0).b = 'w';
return b;
}
void char_array(xt::pyarray<char[20]>& carr)
{
if (strcmp(carr(2), "python"))
{
throw std::runtime_error("TEST FAILED!");
}
std::fill(&carr(2)[0], &carr(2)[0] + 20, 0);
carr(2)[0] = 'c';
carr(2)[1] = '+';
carr(2)[2] = '+';
carr(2)[3] = '\0';
}
void row_major_tensor(xt::pytensor<double, 3, xt::layout_type::row_major>& arg)
{
if (!std::is_same<decltype(arg.begin()), double*>::value)
{
throw std::runtime_error("TEST FAILED");
}
}
void col_major_array(xt::pyarray<double, xt::layout_type::column_major>& arg)
{
if (!std::is_same<decltype(arg.template begin<xt::layout_type::column_major>()), double*>::value)
{
throw std::runtime_error("TEST FAILED");
}
}
xt::pytensor<int, 0> xscalar(const xt::pytensor<int, 1>& arg)
{
return xt::sum(arg);
}
template <class T>
using ndarray = xt::pyarray<T, xt::layout_type::row_major>;
void test_rm(ndarray<int>const& x)
{
ndarray<int> y = x;
ndarray<int> z = xt::zeros<int>({10});
}
PYBIND11_MODULE(xtensor_python_test, m)
{
xt::import_numpy();
m.doc() = "Test module for xtensor python bindings";
m.def("example1", example1);
m.def("example2", example2);
m.def("example3_xarray", example3_xarray);
m.def("example3_xarray_colmajor", example3_xarray_colmajor);
m.def("example3_xtensor3", example3_xtensor3);
m.def("example3_xtensor2", example3_xtensor2);
m.def("example3_xtensor2_colmajor", example3_xtensor2_colmajor);
m.def("complex_overload", no_complex_overload);
m.def("complex_overload", complex_overload);
m.def("complex_overload_reg", no_complex_overload_reg);
m.def("complex_overload_reg", complex_overload_reg);
m.def("readme_example1", readme_example1);
m.def("readme_example2", xt::pyvectorize(readme_example2));
m.def("vectorize_example1", xt::pyvectorize(add));
m.def("rect_to_polar", xt::pyvectorize([](complex_t x) { return std::abs(x); }));
m.def("compare_shapes", [](const xt::pyarray<double>& a, const xt::pyarray<double>& b) {
return a.shape() == b.shape();
});
m.def("test_rm", test_rm);
m.def("int_overload", int_overload<uint8_t>);
m.def("int_overload", int_overload<int8_t>);
m.def("int_overload", int_overload<uint16_t>);
m.def("int_overload", int_overload<int16_t>);
m.def("int_overload", int_overload<uint32_t>);
m.def("int_overload", int_overload<int32_t>);
m.def("int_overload", int_overload<uint64_t>);
m.def("int_overload", int_overload<int64_t>);
m.def("dump_numpy_constant", dump_numpy_constant);
// Register additional dtypes
PYBIND11_NUMPY_DTYPE(A, a, b, c, x);
PYBIND11_NUMPY_DTYPE(B, a, b);
m.def("dtype_to_python", dtype_to_python);
m.def("dtype_from_python", dtype_from_python);
m.def("char_array", char_array);
m.def("col_major_array", col_major_array);
m.def("row_major_tensor", row_major_tensor);
m.def("xscalar", xscalar);
py::class_<C>(m, "C")
.def(py::init<>())
.def_property_readonly(
"copy",
[](C & self) { return self.array(); }
)
.def_property_readonly(
"ref",
[](C & self) -> C::array_type & { return self.array(); }
)
;
m.def("simple_array", [](xt::pyarray<int>) { return 1; } );
m.def("simple_tensor", [](xt::pytensor<int, 1>) { return 2; } );
m.def("diff_shape_overload", [](xt::pytensor<int, 1> a) { return 1; });
m.def("diff_shape_overload", [](xt::pytensor<int, 2> a) { return 2; });
py::class_<test_native_casters>(m, "test_native_casters")
.def(py::init<>())
.def("get_array", &test_native_casters::get_array, py::return_value_policy::reference_internal) // memory managed by the class instance
.def("get_strided_view", &test_native_casters::get_strided_view, py::keep_alive<0, 1>()) // keep_alive<0, 1>() => do not free "self" before the returned view
.def("get_array_adapter", &test_native_casters::get_array_adapter, py::keep_alive<0, 1>()) // keep_alive<0, 1>() => do not free "self" before the returned adapter
.def("get_tensor_adapter", &test_native_casters::get_tensor_adapter, py::keep_alive<0, 1>()) // keep_alive<0, 1>() => do not free "self" before the returned adapter
.def("get_owning_array_adapter", &test_native_casters::get_owning_array_adapter) // auto memory management as the adapter owns its memory
.def("view_keep_alive_member_function", [](test_native_casters & self, xt::pyarray<double> & a) // keep_alive<0, 2>() => do not free second parameter before the returned view
{return xt::reshape_view(a, {a.size(), });},
py::keep_alive<0, 2>());
}