Unable to install detectron2

[akkunesty]

I tried installing Detectron2 inside a virtual environment using the following commands:

python3 -m venv venv1
source venv1/bin/activate
pip install --upgrade pip setuptools wheel ninja
pip install torchvision opencv-python
pip install git+https://github.com/facebookresearch/detectron2.git

Attaching screenshot of the error.

This command sequence was working fine until today, but it now throws the mentioned error.
Could you please look into this issue and suggest the required steps to resolve it?

[github-actions]

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The following information is missing: "Instructions To Reproduce the Issue and Full Logs";

[akkunesty]

Instructions To Reproduce the 🐛 Bug:

1. Full runnable code or full changes you made:

I am unable to solve the issue

2. What exact command you run:

python3 -m venv venv1
source venv1/bin/activate
pip install --upgrade pip setuptools wheel ninja
pip install torchvision opencv-python
pip install git+https://github.com/facebookresearch/detectron2.git

3. Full logs or other relevant observations:

pip install git+https://github.com/facebookresearch/detectron2.git
Collecting git+https://github.com/facebookresearch/detectron2.git
  Cloning https://github.com/facebookresearch/detectron2.git to /tmp/pip-req-build-jr_mmw7q
  Running command git clone --filter=blob:none --quiet https://github.com/facebookresearch/detectron2.git /tmp/pip-req-build-jr_mmw7q
  Resolved https://github.com/facebookresearch/detectron2.git to commit a9c0821a12ad353fb2a96f019515990d5460c5ac
  Installing build dependencies ... done
  Getting requirements to build wheel ... error
  error: subprocess-exited-with-error
  
  × Getting requirements to build wheel did not run successfully.
  │ exit code: 1
  ╰─> [17 lines of output]
      Traceback (most recent call last):
        File "/home/nestym/Roboflow/Training/venv1/lib/python3.10/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 389, in <module>
          main()
        File "/home/nestym/Roboflow/Training/venv1/lib/python3.10/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 373, in main
          json_out["return_val"] = hook(**hook_input["kwargs"])
        File "/home/nestym/Roboflow/Training/venv1/lib/python3.10/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 143, in get_requires_for_build_wheel
          return hook(config_settings)
        File "/tmp/pip-build-env-mvmg8tyj/overlay/lib/python3.10/site-packages/setuptools/build_meta.py", line 331, in get_requires_for_build_wheel
          return self._get_build_requires(config_settings, requirements=[])
        File "/tmp/pip-build-env-mvmg8tyj/overlay/lib/python3.10/site-packages/setuptools/build_meta.py", line 301, in _get_build_requires
          self.run_setup()
        File "/tmp/pip-build-env-mvmg8tyj/overlay/lib/python3.10/site-packages/setuptools/build_meta.py", line 512, in run_setup
          super().run_setup(setup_script=setup_script)
        File "/tmp/pip-build-env-mvmg8tyj/overlay/lib/python3.10/site-packages/setuptools/build_meta.py", line 317, in run_setup
          exec(code, locals())
        File "<string>", line 10, in <module>
      ModuleNotFoundError: No module named 'torch'
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
ERROR: Failed to build 'git+https://github.com/facebookresearch/detectron2.git' when getting requirements to build wheel

4. please simplify the steps as much as possible so they do not require additional resources to
   run, such as a private dataset.
   No dataset is required.Initial step is not working.

Expected behavior:

If there are no obvious error in "full logs" provided above,
please tell us the expected behavior.
It should run and install detectron2

Environment:

Provide your environment information using the following command:

python3 -m venv venv1
source venv1/bin/activate
pip install --upgrade pip setuptools wheel ninja
pip install torchvision opencv-python
pip install git+https://github.com/facebookresearch/detectron2.git

[egru5]

Just to be sure, you installed torchvision and torch?
I had the same problem and found a way to install it with:

git clone https://github.com/facebookresearch/detectron2.git
python -m pip install -e detectron2 --no-build-isolation

[ydshieh]

We also have the same issue in https://github.com/huggingface/transformers CI docker image build

where we do

python3 -m pip install --no-cache-dir git+https://github.com/facebookresearch/detectron2.git

[ydshieh]

@egru5 I got

ERROR: Project file:///detectron2 uses a build backend that is missing the 'build_editable' hook, so it cannot be installed in editable mode. Consider using a build backend that supports PEP 660.

when switched the -e method

[akkunesty]

Just to be sure, you installed torchvision and torch? I had the same problem and found a way to install it with:

git clone https://github.com/facebookresearch/detectron2.git
python -m pip install -e detectron2 --no-build-isolation

Yes this worked.Thanks!

[ydshieh]

@akkunesty Would you mind to reopen the issue as I got

ERROR: Project file:///detectron2 uses a build backend that is missing the 'build_editable' hook, so it cannot be installed in editable mode. Consider using a build backend that supports PEP 660.

And even if this approach works in your case and egru5's case, it is still questionable why

pip install git+https://github.com/facebookresearch/detectron2.git

no longer works ...

Otherwise, I can open a new issue myself if you prefer.

[ydshieh]

It turns out that --no-build-isolation is the key to make it work.