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Installation

Our Colab Notebook has step-by-step instructions that install detectron2. The Dockerfile also installs detectron2 with a few simple commands.

Requirements

  • Linux or macOS with Python ≥ 3.6
  • PyTorch ≥ 1.4 and torchvision that matches the PyTorch installation. You can install them together at pytorch.org to make sure of this
  • OpenCV is optional and needed by demo and visualization

Build Detectron2 from Source

gcc & g++ ≥ 5 are required. ninja is recommended for faster build. After having them, run:

python -m pip install 'git+https://github.com/facebookresearch/detectron2.git'
# (add --user if you don't have permission)

# Or, to install it from a local clone:
git clone https://github.com/facebookresearch/detectron2.git
python -m pip install -e detectron2

# Or if you are on macOS
CC=clang CXX=clang++ python -m pip install ......

To rebuild detectron2 that's built from a local clone, use rm -rf build/ **/*.so to clean the old build first. You often need to rebuild detectron2 after reinstalling PyTorch.

Install Pre-Built Detectron2 (Linux only)

Choose from this table to install v0.2.1 (Aug 2020):

CUDA torch 1.6torch 1.5torch 1.4
10.2
install 
python -m pip install detectron2 -f \
  https://dl.fbaipublicfiles.com/detectron2/wheels/cu102/torch1.6/index.html
install 
python -m pip install detectron2 -f \
  https://dl.fbaipublicfiles.com/detectron2/wheels/cu102/torch1.5/index.html
10.1
install 
python -m pip install detectron2 -f \
  https://dl.fbaipublicfiles.com/detectron2/wheels/cu101/torch1.6/index.html
install 
python -m pip install detectron2 -f \
  https://dl.fbaipublicfiles.com/detectron2/wheels/cu101/torch1.5/index.html
install 
python -m pip install detectron2 -f \
  https://dl.fbaipublicfiles.com/detectron2/wheels/cu101/torch1.4/index.html
10.0
install 
python -m pip install detectron2 -f \
  https://dl.fbaipublicfiles.com/detectron2/wheels/cu100/torch1.4/index.html
9.2
install 
python -m pip install detectron2 -f \
  https://dl.fbaipublicfiles.com/detectron2/wheels/cu92/torch1.6/index.html
install 
python -m pip install detectron2 -f \
  https://dl.fbaipublicfiles.com/detectron2/wheels/cu92/torch1.5/index.html
install 
python -m pip install detectron2 -f \
  https://dl.fbaipublicfiles.com/detectron2/wheels/cu92/torch1.4/index.html
cpu
install 
python -m pip install detectron2 -f \
  https://dl.fbaipublicfiles.com/detectron2/wheels/cpu/torch1.6/index.html
install 
python -m pip install detectron2 -f \
  https://dl.fbaipublicfiles.com/detectron2/wheels/cpu/torch1.5/index.html
install 
python -m pip install detectron2 -f \
  https://dl.fbaipublicfiles.com/detectron2/wheels/cpu/torch1.4/index.html

Note that:

  1. The pre-built package has to be used with corresponding version of CUDA and official PyTorch release. It will not work with a different version of PyTorch or a non-official build of PyTorch.
  2. New packages are released every few months. Therefore, packages may not contain latest features in the master branch and may not be compatible with the master branch of a research project that uses detectron2 (e.g. those in projects).

Common Installation Issues

Click each issue for its solutions:

Undefined symbols that contains TH,aten,torch,caffe2; Missing torch dynamic libraries; Segmentation fault immediately when using detectron2.

This usually happens when detectron2 or torchvision is not compiled with the version of PyTorch you're running.

If the error comes from a pre-built torchvision, uninstall torchvision and pytorch and reinstall them following pytorch.org. So the versions will match.

If the error comes from a pre-built detectron2, check release notes to see the corresponding pytorch version required for each pre-built detectron2. Or uninstall and reinstall the correct pre-built detectron2.

If the error comes from detectron2 or torchvision that you built manually from source, remove files you built (build/, **/*.so) and rebuild it so it can pick up the version of pytorch currently in your environment.

If you cannot resolve this problem, please include the output of gdb -ex "r" -ex "bt" -ex "quit" --args python -m detectron2.utils.collect_env in your issue.

Undefined C++ symbols (e.g. `GLIBCXX`) or C++ symbols not found.
Usually it's because the library is compiled with a newer C++ compiler but run with an old C++ runtime.

This often happens with old anaconda. Try conda update libgcc. Then rebuild detectron2.

The fundamental solution is to run the code with proper C++ runtime. One way is to use LD_PRELOAD=/path/to/libstdc++.so.

"nvcc not found" or "Not compiled with GPU support" or "Detectron2 CUDA Compiler: not available".
CUDA is not found when building detectron2. You should make sure 
python -c 'import torch; from torch.utils.cpp_extension import CUDA_HOME; print(torch.cuda.is_available(), CUDA_HOME)'

print (True, a directory with cuda) at the time you build detectron2.

Most models can run inference (but not training) without GPU support. To use CPUs, set MODEL.DEVICE='cpu' in the config.

"invalid device function" or "no kernel image is available for execution".
Two possibilities:

  • You build detectron2 with one version of CUDA but run it with a different version.

    To check whether it is the case, use python -m detectron2.utils.collect_env to find out inconsistent CUDA versions. In the output of this command, you should expect "Detectron2 CUDA Compiler", "CUDA_HOME", "PyTorch built with - CUDA" to contain cuda libraries of the same version.

    When they are inconsistent, you need to either install a different build of PyTorch (or build by yourself) to match your local CUDA installation, or install a different version of CUDA to match PyTorch.

  • PyTorch/torchvision/Detectron2 is not built for the correct GPU architecture (aka. compute capability).

    The architecture included by PyTorch/detectron2/torchvision is available in the "architecture flags" in python -m detectron2.utils.collect_env. It must include the architecture of your GPU, which can be found at developer.nvidia.com/cuda-gpus.

    If you're using pre-built PyTorch/detectron2/torchvision, they have included support for most popular GPUs already. If not supported, you need to build them from source.

    When building detectron2/torchvision from source, they detect the GPU device and build for only the device. This means the compiled code may not work on a different GPU device. To recompile them for the correct architecture, remove all installed/compiled files, and rebuild them with the TORCH_CUDA_ARCH_LIST environment variable set properly. For example, export TORCH_CUDA_ARCH_LIST=6.0,7.0 makes it compile for both P100s and V100s.

Undefined CUDA symbols; Cannot open libcudart.so
The version of NVCC you use to build detectron2 or torchvision does not match the version of CUDA you are running with. This often happens when using anaconda's CUDA runtime.

Use python -m detectron2.utils.collect_env to find out inconsistent CUDA versions. In the output of this command, you should expect "Detectron2 CUDA Compiler", "CUDA_HOME", "PyTorch built with - CUDA" to contain cuda libraries of the same version.

When they are inconsistent, you need to either install a different build of PyTorch (or build by yourself) to match your local CUDA installation, or install a different version of CUDA to match PyTorch.

C++ compilation errors from NVCC

  1. NVCC version has to match the CUDA version of your PyTorch.

  2. The combination of NVCC and GCC you use is incompatible. You need to change one of their versions. See here for some valid combinations.

The CUDA/GCC version used by PyTorch can be found by print(torch.__config__.show()).

"ImportError: cannot import name '_C'".
Please build and install detectron2 following the instructions above.

Or, if you are running code from detectron2's root directory, cd to a different one. Otherwise you may not import the code that you installed.

Any issue on windows.

Detectron2 is continuously built on windows with CircleCI. However we do not provide official support for it. PRs that improves code compatibility on windows are welcome.

ONNX conversion segfault after some "TraceWarning".
The ONNX package is compiled with a too old compiler.

Please build and install ONNX from its source code using a compiler whose version is closer to what's used by PyTorch (available in torch.__config__.show()).