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{
lib,
buildPythonPackage,
fetchFromGitHub,
einops,
ninja,
setuptools,
symlinkJoin,
torch,
}:
let
inherit (torch) cudaCapabilities cudaPackages cudaSupport;
inherit (cudaPackages) backendStdenv;
in
buildPythonPackage rec {
pname = "flash-attention";
version = "2.8.2";
pyproject = true;
src = fetchFromGitHub {
owner = "Dao-AILab";
repo = "flash-attention";
tag = "v${version}";
hash = "sha256-iHxfDh+rGanhymP5F7g8rQcQUlP0oXliVF+y+ur/iJ0=";
fetchSubmodules = true;
};
preConfigure = ''
export MAX_JOBS="$NIX_BUILD_CORES"
export NVCC_THREADS="$NIX_BUILD_CORES"
'';
env = lib.optionalAttrs cudaSupport {
FLASH_ATTENTION_SKIP_CUDA_BUILD = "FALSE";
CC = "${backendStdenv.cc}/bin/cc";
CXX = "${backendStdenv.cc}/bin/c++";
TORCH_CUDA_ARCH_LIST = "${lib.concatStringsSep ";" cudaCapabilities}";
};
build-system = [
ninja
setuptools
cudaPackages.cuda_nvcc
];
buildInputs = [
cudaPackages.cuda_cccl # <thrust/*>
cudaPackages.libcublas # cublas_v2.h
cudaPackages.libcurand # curand.h
cudaPackages.libcusolver # cusolverDn.h
cudaPackages.libcusparse # cusparse.h
cudaPackages.cuda_cudart # cuda_runtime.h cuda_runtime_api.h
];
dependencies = [
einops
torch
];
# Requires NVIDIA driver.
doCheck = false;
pythonImportsCheck = [ "flash_attn" ];
meta = {
# Upstream requires either CUDA or ROCm. Couldn't get it to work with ROCm for now.
broken = !cudaSupport;
description = "Official implementation of FlashAttention and FlashAttention-2";
homepage = "https://github.com/Dao-AILab/flash-attention/";
changelog = "https://github.com/Dao-AILab/flash-attention/releases/tag/${src.tag}";
license = lib.licenses.bsd3;
maintainers = with lib.maintainers; [ jherland ];
};
}
|
