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# Copyright 2022-2024 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=8

PYTHON_COMPAT=( python3_{9..12} )
inherit python-single-r1 cmake cuda flag-o-matic prefix

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 distributed fbgemm ffmpeg gloo mkl mpi nnpack +numpy onednn openblas opencl opencv openmp qnnpack tensorpipe xnnpack"
RESTRICT="test"
REQUIRED_USE="
	${PYTHON_REQUIRED_USE}
	ffmpeg? ( opencv )
	mpi? ( distributed )
	tensorpipe? ( distributed )
	distributed? ( tensorpipe )
	gloo? ( distributed )
" # ?? ( cuda rocm )

# CUDA 12 not supported yet: https://github.com/pytorch/pytorch/issues/91122
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
	virtual/lapack
	>=sci-libs/onnx-1.12.0
	<sci-libs/onnx-1.15.0
	sci-libs/foxi
	cuda? (
		=dev-libs/cudnn-8*
		>=dev-libs/cudnn-frontend-0.9.2:0/8
		dev-util/nvidia-cuda-toolkit:=[profiler]
	)
	fbgemm? ( >=dev-libs/FBGEMM-2023.11.02 )
	ffmpeg? ( media-video/ffmpeg:= )
	gloo? ( sci-libs/gloo[cuda?] )
	mpi? ( virtual/mpi )
	nnpack? ( sci-libs/NNPACK )
	numpy? ( $(python_gen_cond_dep '
		dev-python/numpy[${PYTHON_USEDEP}]
		') )
	onednn? ( dev-libs/oneDNN )
	opencl? ( virtual/opencl )
	opencv? ( media-libs/opencv:= )
	qnnpack? ( sci-libs/QNNPACK )
	tensorpipe? ( sci-libs/tensorpipe[cuda?] )
	xnnpack? ( >=sci-libs/XNNPACK-2022.12.22 )
	mkl? ( sci-libs/mkl )
	openblas? ( sci-libs/openblas )
"
DEPEND="
	${RDEPEND}
	cuda? ( >=dev-libs/cutlass-3.1.0 )
	onednn? ( sci-libs/ideep )
	dev-libs/psimd
	dev-libs/FP16
	dev-libs/FXdiv
	dev-libs/pocketfft
	dev-libs/flatbuffers
	>=sci-libs/kineto-0.4.0_p20231031
	$(python_gen_cond_dep '
		dev-python/pyyaml[${PYTHON_USEDEP}]
		dev-python/pybind11[${PYTHON_USEDEP}]
	')
"

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

PATCHES=(
	"${FILESDIR}"/${PN}-2.1.1-gentoo.patch
	"${FILESDIR}"/${PN}-1.13.0-install-dirs.patch
	"${FILESDIR}"/${PN}-1.12.0-glog-0.6.0.patch
	"${FILESDIR}"/${PN}-1.13.1-tensorpipe.patch
	"${FILESDIR}"/${PN}-2.0.0-gcc13.patch
	"${FILESDIR}"/${PN}-2.0.0-cudnn_include_fix.patch
	"${FILESDIR}"/${PN}-2.1.1-cudaExtra.patch
	"${FILESDIR}"/${PN}-2.1.2-fix-rpath.patch
	"${FILESDIR}"/${PN}-2.1.2-fix-openmp-link.patch
)

src_prepare() {
	filter-lto #bug 862672
	sed -i \
		-e "/third_party\/gloo/d" \
		cmake/Dependencies.cmake \
		|| die
	cmake_src_prepare
	pushd torch/csrc/jit/serialization || die
	flatc --cpp --gen-mutable --scoped-enums mobile_bytecode.fbs || die
	popd
	# prefixify the hardcoded paths, after all patches are applied
	hprefixify \
		aten/CMakeLists.txt \
		caffe2/CMakeLists.txt \
		cmake/Metal.cmake \
		cmake/Modules/*.cmake \
		cmake/Modules_CUDA_fix/FindCUDNN.cmake \
		cmake/Modules_CUDA_fix/upstream/FindCUDA/make2cmake.cmake \
		cmake/Modules_CUDA_fix/upstream/FindPackageHandleStandardArgs.cmake \
		cmake/public/LoadHIP.cmake \
		cmake/public/cuda.cmake \
		cmake/Dependencies.cmake \
		torch/CMakeLists.txt \
		CMakeLists.txt
}

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

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

		-DUSE_CCACHE=OFF
		-DUSE_CUDA=$(usex cuda)
		-DUSE_CUDNN=$(usex cuda)
		-DTORCH_CUDA_ARCH_LIST="${TORCH_CUDA_ARCH_LIST:-3.5 7.0}"
		-DBUILD_NVFUSER=$(usex cuda)
		-DUSE_DISTRIBUTED=$(usex distributed)
		-DUSE_MPI=$(usex mpi)
		-DUSE_FAKELOWP=OFF
		-DUSE_FBGEMM=$(usex fbgemm)
		-DUSE_FFMPEG=$(usex ffmpeg)
		-DUSE_GFLAGS=ON
		-DUSE_GLOG=ON
		-DUSE_GLOO=$(usex gloo)
		-DUSE_KINETO=OFF # TODO
		-DUSE_LEVELDB=OFF
		-DUSE_MAGMA=OFF # TODO: In GURU as sci-libs/magma
		-DUSE_MKLDNN=$(usex onednn)
		-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_TENSORPIPE=$(usex tensorpipe)
		-DUSE_PYTORCH_QNNPACK=OFF
		-DUSE_NUMPY=$(usex numpy)
		-DUSE_OPENCL=$(usex opencl)
		-DUSE_OPENCV=$(usex opencv)
		-DUSE_OPENMP=$(usex openmp)
		-DUSE_ROCM=OFF # TODO
		-DUSE_SYSTEM_CPUINFO=ON
		-DUSE_SYSTEM_PYBIND11=ON
		-DUSE_UCC=OFF
		-DUSE_VALGRIND=OFF
		-DPYBIND11_PYTHON_VERSION="${EPYTHON#python}"
		-DPYTHON_EXECUTABLE="${PYTHON}"
		-DUSE_ITT=OFF
		-DUSE_SYSTEM_PTHREADPOOL=ON
		-DUSE_SYSTEM_FXDIV=ON
		-DUSE_SYSTEM_FP16=ON
		-DUSE_SYSTEM_GLOO=ON
		-DUSE_SYSTEM_ONNX=ON
		-DUSE_SYSTEM_SLEEF=ON
		-DUSE_METAL=OFF

		-Wno-dev
		-DTORCH_INSTALL_LIB_DIR="${EPREFIX}"/usr/$(get_libdir)
		-DLIBSHM_INSTALL_LIB_SUBDIR="${EPREFIX}"/usr/$(get_libdir)
	)

	if use mkl; then
		mycmakeargs+=(-DBLAS=MKL)
	elif use openblas; then
		mycmakeargs+=(-DBLAS=OpenBLAS)
	else
		mycmakeargs+=(-DBLAS=Generic -DBLAS_LIBRARIES=)
	fi

	if use cuda; then
		addpredict "/dev/nvidiactl" # bug 867706
		addpredict "/dev/char"

		mycmakeargs+=(
			-DCMAKE_CUDA_FLAGS="$(cuda_gccdir -f | tr -d \")"
		)
	fi

	if use onednn; then
		mycmakeargs+=(
			-DUSE_MKLDNN=ON
			-DMKLDNN_FOUND=ON
			-DMKLDNN_LIBRARIES=dnnl
			-DMKLDNN_INCLUDE_DIR="${ESYSROOT}/usr/include/oneapi/dnnl"
		)
	fi

	cmake_src_configure
}

src_install() {
	cmake_src_install

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

	rm -rf python
	mkdir -p python/torch/include || die
	mv "${ED}"/usr/lib/python*/site-packages/caffe2 python/ || die
	if use cuda; then
		mv "${ED}${S}"/nvfuser python/nvfuser || die
		mv "${ED}"/usr/$(get_libdir)/nvfuser.so python/nvfuser/_C.so || die
	fi
	cp torch/version.py python/torch/ || die
	python_domodule python/caffe2
	python_domodule python/torch
	ln -s ../../../../../include/torch \
		"${D}$(python_get_sitedir)"/torch/include/torch || die # bug 923269
	if use cuda; then
		python_domodule python/nvfuser
	fi
	rm -rf "${ED}"/var/tmp
	find "${ED}" -empty -delete
}