# Adapted from https://github.com/NVIDIA/apex/blob/master/setup.py import sys import warnings import os from pathlib import Path from setuptools import setup, find_packages import subprocess import torch from torch.utils.cpp_extension import BuildExtension, CppExtension, CUDAExtension, CUDA_HOME with open("README.md", "r", encoding="utf-8") as fh: long_description = fh.read() # ninja build does not work unless include_dirs are abs path this_dir = os.path.dirname(os.path.abspath(__file__)) def get_cuda_bare_metal_version(cuda_dir): raw_output = subprocess.check_output([cuda_dir + "/bin/nvcc", "-V"], universal_newlines=True) output = raw_output.split() release_idx = output.index("release") + 1 release = output[release_idx].split(".") bare_metal_major = release[0] bare_metal_minor = release[1][0] return raw_output, bare_metal_major, bare_metal_minor def check_cuda_torch_binary_vs_bare_metal(cuda_dir): raw_output, bare_metal_major, bare_metal_minor = get_cuda_bare_metal_version(cuda_dir) torch_binary_major = torch.version.cuda.split(".")[0] torch_binary_minor = torch.version.cuda.split(".")[1] print("\nCompiling cuda extensions with") print(raw_output + "from " + cuda_dir + "/bin\n") if (bare_metal_major != torch_binary_major) or (bare_metal_minor != torch_binary_minor): raise RuntimeError( "Cuda extensions are being compiled with a version of Cuda that does " "not match the version used to compile Pytorch binaries. " "Pytorch binaries were compiled with Cuda {}.\n".format(torch.version.cuda) + "In some cases, a minor-version mismatch will not cause later errors: " "https://github.com/NVIDIA/apex/pull/323#discussion_r287021798. " "You can try commenting out this check (at your own risk)." ) def raise_if_cuda_home_none(global_option: str) -> None: if CUDA_HOME is not None: return raise RuntimeError( f"{global_option} was requested, but nvcc was not found. Are you sure your environment has nvcc available? " "If you're installing within a container from https://hub.docker.com/r/pytorch/pytorch, " "only images whose names contain 'devel' will provide nvcc." ) def append_nvcc_threads(nvcc_extra_args): _, bare_metal_major, bare_metal_minor = get_cuda_bare_metal_version(CUDA_HOME) if int(bare_metal_major) >= 11 and int(bare_metal_minor) >= 2: return nvcc_extra_args + ["--threads", "4"] return nvcc_extra_args if not torch.cuda.is_available(): # https://github.com/NVIDIA/apex/issues/486 # Extension builds after https://github.com/pytorch/pytorch/pull/23408 attempt to query torch.cuda.get_device_capability(), # which will fail if you are compiling in an environment without visible GPUs (e.g. during an nvidia-docker build command). print( "\nWarning: Torch did not find available GPUs on this system.\n", "If your intention is to cross-compile, this is not an error.\n" "By default, We cross-compile for Volta (compute capability 7.0), " "Turing (compute capability 7.5),\n" "and, if the CUDA version is >= 11.0, Ampere (compute capability 8.0).\n" "If you wish to cross-compile for a single specific architecture,\n" 'export TORCH_CUDA_ARCH_LIST="compute capability" before running setup.py.\n', ) if os.environ.get("TORCH_CUDA_ARCH_LIST", None) is None: _, bare_metal_major, bare_metal_minor = get_cuda_bare_metal_version(CUDA_HOME) if int(bare_metal_major) == 11: os.environ["TORCH_CUDA_ARCH_LIST"] = "7.0;7.5;8.0" if int(bare_metal_minor) > 0: os.environ["TORCH_CUDA_ARCH_LIST"] = "7.0;7.5;8.0;8.6" else: os.environ["TORCH_CUDA_ARCH_LIST"] = "7.0;7.5" print("\n\ntorch.__version__ = {}\n\n".format(torch.__version__)) TORCH_MAJOR = int(torch.__version__.split(".")[0]) TORCH_MINOR = int(torch.__version__.split(".")[1]) cmdclass = {} ext_modules = [] # Check, if ATen/CUDAGeneratorImpl.h is found, otherwise use ATen/cuda/CUDAGeneratorImpl.h # See https://github.com/pytorch/pytorch/pull/70650 generator_flag = [] torch_dir = torch.__path__[0] if os.path.exists(os.path.join(torch_dir, "include", "ATen", "CUDAGeneratorImpl.h")): generator_flag = ["-DOLD_GENERATOR_PATH"] raise_if_cuda_home_none("flash_attn") # Check, if CUDA11 is installed for compute capability 8.0 cc_flag = [] _, bare_metal_major, _ = get_cuda_bare_metal_version(CUDA_HOME) if int(bare_metal_major) < 11: raise RuntimeError("FlashAttention is only supported on CUDA 11") cc_flag.append("-gencode") cc_flag.append("arch=compute_75,code=sm_75") cc_flag.append("-gencode") cc_flag.append("arch=compute_80,code=sm_80") subprocess.run(["git", "submodule", "update", "--init", "csrc/flash_attn/cutlass"]) ext_modules.append( CUDAExtension( name="flash_attn_cuda", sources=[ "csrc/flash_attn/fmha_api.cpp", "csrc/flash_attn/src/fmha_fprop_fp16_kernel.sm80.cu", "csrc/flash_attn/src/fmha_dgrad_fp16_kernel_loop.sm80.cu", "csrc/flash_attn/src/fmha_block_fprop_fp16_kernel.sm80.cu", "csrc/flash_attn/src/fmha_block_dgrad_fp16_kernel_loop.sm80.cu", ], extra_compile_args={ "cxx": ["-O3", "-std=c++17"] + generator_flag, "nvcc": append_nvcc_threads( [ "-O3", "-std=c++17", "-U__CUDA_NO_HALF_OPERATORS__", "-U__CUDA_NO_HALF_CONVERSIONS__", "--expt-relaxed-constexpr", "--expt-extended-lambda", "--use_fast_math", "--ptxas-options=-v", "-lineinfo" ] + generator_flag + cc_flag ), }, include_dirs=[ Path(this_dir) / 'csrc' / 'flash_attn', Path(this_dir) / 'csrc' / 'flash_attn' / 'src', Path(this_dir) / 'csrc' / 'flash_attn' / 'cutlass' / 'include', ], ) ) setup( name="flash_attn", version="0.2.1", packages=find_packages( exclude=("build", "csrc", "include", "tests", "dist", "docs", "benchmarks", "flash_attn.egg-info",) ), author="Tri Dao", author_email="trid@stanford.edu", description="Flash Attention: Fast and Memory-Efficient Exact Attention", long_description=long_description, long_description_content_type="text/markdown", url="https://github.com/HazyResearch/flash-attention", classifiers=[ "Programming Language :: Python :: 3", "License :: OSI Approved :: BSD License", "Operating System :: Unix", ], ext_modules=ext_modules, cmdclass={"build_ext": BuildExtension} if ext_modules else {}, python_requires=">=3.7", install_requires=[ "torch", "einops", ], )