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# Copyright 2022 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=8

PYTHON_COMPAT=( python3_{8..10} )
inherit python-r1 cmake flag-o-matic

MYPN=pytorch
MYP=${MYPN}-${PV}

DESCRIPTION="A deep learning framework"
HOMEPAGE="https://pytorch.org/"
SRC_URI="https://github.com/pytorch/${MYPN}/archive/refs/tags/v${PV}.tar.gz
	-> ${MYP}.tar.gz"

LICENSE="BSD"
SLOT="0"
KEYWORDS="~amd64"
IUSE="cuda ffmpeg nnpack +numpy opencl opencv openmp qnnpack xnnpack"
RESTRICT="test"
REQUIRED_USE="
	${PYTHON_REQUIRED_USE}
	ffmpeg? ( opencv )
" # ?? ( cuda rocm )

RDEPEND="
	${PYTHON_DEPS}
	dev-cpp/gflags:=
	>=dev-cpp/glog-0.5.0
	dev-libs/cpuinfo
	dev-libs/libfmt
	dev-libs/protobuf
	dev-libs/pthreadpool
	dev-libs/sleef
	sci-libs/lapack
	sci-libs/onnx
	sci-libs/foxi
	cuda? (
		=dev-libs/cudnn-8*
		dev-libs/cudnn-frontend:0/8
		dev-util/nvidia-cuda-toolkit:=[profiler]
	)
	ffmpeg? ( media-video/ffmpeg:= )
	nnpack? ( sci-libs/NNPACK )
	numpy? ( dev-python/numpy[${PYTHON_USEDEP}] )
	opencl? ( virtual/opencl )
	opencv? ( media-libs/opencv:= )
	qnnpack? ( sci-libs/QNNPACK )
	xnnpack? ( sci-libs/XNNPACK )
"
DEPEND="
	${RDEPEND}
	dev-cpp/eigen
	dev-libs/psimd
	dev-libs/FP16
	dev-libs/FXdiv
	dev-libs/pocketfft
	dev-libs/flatbuffers
	dev-python/pyyaml[${PYTHON_USEDEP}]
	dev-python/pybind11[${PYTHON_USEDEP}]
"

S="${WORKDIR}"/${MYP}

PATCHES=(
	"${FILESDIR}"/${PN}-1.11.0-gentoo.patch
	"${FILESDIR}"/${PN}-1.12.0-install-dirs.patch
	"${FILESDIR}"/${P}-glog-0.6.0.patch
)

src_prepare() {
	filter-lto #bug 862672
	cmake_src_prepare
	pushd torch/csrc/jit/serialization || die
	flatc --cpp --gen-mutable --scoped-enums mobile_bytecode.fbs || die
	popd
}

src_configure() {
	if use cuda && [[ -z ${TORCH_CUDA_ARCH_LIST} ]]; then
		ewarn "WARNING: caffe2 is being built with its default CUDA compute capabilities: 3.5 and 7.0."
		ewarn "These may not be optimal for your GPU."
		ewarn ""
		ewarn "To configure caffe2 with the CUDA compute capability that is optimal for your GPU,"
		ewarn "set TORCH_CUDA_ARCH_LIST in your make.conf, and re-emerge caffe2."
		ewarn "For example, to use CUDA capability 7.5 & 3.5, add: TORCH_CUDA_ARCH_LIST=7.5,3.5"
		ewarn "For a Maxwell model GPU, an example value would be: TORCH_CUDA_ARCH_LIST=Maxwell"
		ewarn ""
		ewarn "You can look up your GPU's CUDA compute capability at https://developer.nvidia.com/cuda-gpus"
		ewarn "or by running /opt/cuda/extras/demo_suite/deviceQuery | grep 'CUDA Capability'"
	fi

	python_setup
	local mycmakeargs=(
		-DBUILD_CUSTOM_PROTOBUF=OFF
		-DBUILD_SHARED_LIBS=ON

		-DUSE_CCACHE=OFF
		-DUSE_CUDA=$(usex cuda)
		-DUSE_CUDNN=$(usex cuda)
		-DUSE_FAST_NVCC=$(usex cuda)
		-DTORCH_CUDA_ARCH_LIST="${TORCH_CUDA_ARCH_LIST:-3.5 7.0}"
		-DUSE_DISTRIBUTED=OFF
		-DUSE_FAKELOWP=OFF
		-DUSE_FBGEMM=OFF # TODO
		-DUSE_FFMPEG=$(usex ffmpeg)
		-DUSE_GFLAGS=ON
		-DUSE_GLOG=ON
		-DUSE_GLOO=OFF
		-DUSE_KINETO=OFF # TODO
		-DUSE_LEVELDB=OFF
		-DUSE_MAGMA=OFF # TODO: In GURU as sci-libs/magma
		-DUSE_MKLDNN=OFF
		-DUSE_NCCL=OFF # TODO: NVIDIA Collective Communication Library
		-DUSE_NNPACK=$(usex nnpack)
		-DUSE_QNNPACK=$(usex qnnpack)
		-DUSE_XNNPACK=$(usex xnnpack)
		-DUSE_SYSTEM_XNNPACK=$(usex xnnpack)
		-DUSE_PYTORCH_QNNPACK=OFF
		-DUSE_NUMPY=$(usex numpy)
		-DUSE_OPENCL=$(usex opencl)
		-DUSE_OPENCV=$(usex opencv)
		-DUSE_OPENMP=$(usex openmp)
		-DUSE_ROCM=OFF # TODO
		-DUSE_SYSTEM_CPUINFO=ON
		-DUSE_SYSTEM_BIND11=ON
		-DPYBIND11_PYTHON_VERSION="${EPYTHON#python}"
		-DPYTHON_EXECUTABLE="${PYTHON}"
		-DUSE_SYSTEM_EIGEN_INSTALL=ON
		-DUSE_SYSTEM_PTHREADPOOL=ON
		-DUSE_SYSTEM_FXDIV=ON
		-DUSE_SYSTEM_FP16=ON
		-DUSE_SYSTEM_ONNX=ON
		-DUSE_SYSTEM_SLEEF=ON
		-DUSE_TENSORPIPE=OFF

		-Wno-dev
		-DTORCH_INSTALL_LIB_DIR=/usr/$(get_libdir)
		-DLIBSHM_INSTALL_LIB_SUBDIR=/usr/$(get_libdir)
	)

	use cuda && addpredict "/dev/nvidiactl" # bug 867706
	cmake_src_configure
}

python_install() {
	python_domodule python/caffe2
	python_domodule python/torch
}

src_install() {
	cmake_src_install

	insinto "/var/lib/${PN}"
	doins "${BUILD_DIR}"/CMakeCache.txt

	rm -rf python
	mkdir -p python/torch || die
	mv "${D}"/usr/lib/python*/site-packages/caffe2 python/ || die
	cp torch/version.py python/torch/ || die
	python_foreach_impl python_install
}