MegEngine/imperative/python/src/module_trace.cpp

/**
 * \file imperative/python/src/module_trace.cpp
 * MegEngine is Licensed under the Apache License, Version 2.0 (the "License")
 *
 * Copyright (c) 2014-2021 Megvii Inc. All rights reserved.
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT ARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied.
 */

#include "./module_trace.h"
#include "./helper.h" // include op pybind11 caster

namespace py = pybind11;

namespace mgb::imperative::python {

apply_result_t apply_module_trace(ApplyContext& ctx) {
    apply_result_t outputs;

    auto args = py::tuple(ctx.nargs + 1);
    args[0] = py::cast(ctx.op);
    for (size_t i = 0; i < ctx.nargs; i++) {
        args[i + 1] = TensorWrapper::make(ctx.args[i]->shared_from_this());
    }
    auto pyout = PyObject_Call(cpp_apply_module_trace, args.ptr(), nullptr);
    if (!pyout) throw py::error_already_set();
    auto ret = py::reinterpret_steal<py::object>(pyout);

    // assumption: python function always returns PyList
    auto tup = py::reinterpret_borrow<py::list>(ret);
    for (auto i = 0; i < tup.size(); i++) {
        auto tw = TensorWrapper::try_cast(tup[i].ptr());
        outputs.emplace_back(tw->m_tensor);
    }
    return outputs;
}

} // namespace mgb::imperative::python