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125 lines
3.6 KiB
125 lines
3.6 KiB
/* Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License. */
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#pragma once
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#include <Python.h>
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#include <vector>
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#include "glog/logging.h"
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#include "paddle/fluid/platform/variant.h"
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#include "pybind11/numpy.h"
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#include "pybind11/pybind11.h"
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#include "pybind11/stl.h"
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// Cast boost::variant for PyBind.
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// Copy from
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// https://github.com/pybind/pybind11/issues/576#issuecomment-269563199
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namespace pybind11 {
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namespace detail {
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#if !defined(PYBIND11_HIDDEN)
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#ifdef _WIN32
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#define PYBIND11_HIDDEN __declspec(dllexport)
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#else
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#define PYBIND11_HIDDEN __attribute__((visibility("hidden")))
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#endif
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#endif
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// Can be replaced by a generic lambda in C++14
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struct PYBIND11_HIDDEN paddle_variant_caster_visitor
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: public boost::static_visitor<handle> {
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return_value_policy policy;
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handle parent;
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paddle_variant_caster_visitor(return_value_policy policy, handle parent)
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: policy(policy), parent(parent) {}
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template <class T>
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handle operator()(T const &src) const {
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return make_caster<T>::cast(src, policy, parent);
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}
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};
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template <class Variant>
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struct paddle_variant_caster;
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template <template <class...> class V, class... Ts>
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struct paddle_variant_caster<V<Ts...>> {
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using Type = V<Ts...>;
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template <typename T>
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typename std::enable_if<
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!std::is_same<T, boost::detail::variant::void_>::value, bool>::type
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try_load(handle src, bool convert) {
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auto caster = make_caster<T>();
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if (!load_success_ && caster.load(src, convert)) {
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load_success_ = true;
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if (std::is_same<T, std::vector<float>>::value) {
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auto caster_ints = make_caster<std::vector<int64_t>>();
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if (caster_ints.load(src, convert)) {
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VLOG(4) << "This value are floats and int64_ts satisfy "
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"simultaneously, will set it's type to "
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"std::vector<int64_t>";
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value = cast_op<std::vector<int64_t>>(caster_ints);
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return true;
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}
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}
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if (std::is_same<T, float>::value) {
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auto caster_int64 = make_caster<int64_t>();
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if (caster_int64.load(src, convert)) {
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VLOG(4) << "this value are float and int64 satisfy simula.";
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value = cast_op<int64_t>(caster_int64);
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return true;
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}
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}
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value = cast_op<T>(caster);
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return true;
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}
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return false;
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}
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template <typename T>
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typename std::enable_if<std::is_same<T, boost::detail::variant::void_>::value,
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bool>::type
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try_load(handle src, bool convert) {
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return false;
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}
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bool load(handle src, bool convert) {
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auto unused = {false, try_load<Ts>(src, convert)...};
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(void)(unused);
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return load_success_;
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}
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static handle cast(Type const &src, return_value_policy policy,
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handle parent) {
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paddle_variant_caster_visitor visitor(policy, parent);
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return boost::apply_visitor(visitor, src);
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}
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PYBIND11_TYPE_CASTER(Type, _("Variant"));
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bool load_success_{false};
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};
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// Add specialization for concrete variant type
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template <class... Args>
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struct type_caster<boost::variant<Args...>>
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: paddle_variant_caster<boost::variant<Args...>> {};
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} // namespace detail
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} // namespace pybind11
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