'Ninja is required to load C++ extensions

I download a program and want to run it. It's from github.

I enter the experiments/segmentation/ folder, and input "python test.py --dataset PContext --model-zoo Encnet_ResNet50_PContext --eval" to the terminal.

The terminal shows "RuntimeError: Ninja is required to load C++ extensions. " I have searched the Internet for a night but found no such questions.

Can anybody help me? It's my first time to come here to ask questions

python ninja

Solution 1:^[1]

I just had the same issue with my code. To solve it I installed ninja with pip :

pip install Ninja

Solution 2:^[2]

Did you install PyTorch? Did you install PyTorch-Encoding? (see https://hangzhang.org/PyTorch-Encoding/notes/compile.html)

You should install those packages (and all depencies are fetched automatically) with PIP. You can not just download the source and start! It is always a good idea to at least read the basic documentation of the package you are using.

Solution 3:^[3]

This worked for me.

wget https://github.com/ninja-build/ninja/releases/download/v1.10.2/ninja-linux.zip
sudo unzip ninja-linux.zip -d /usr/local/bin/
sudo update-alternatives --install /usr/bin/ninja ninja /usr/local/bin/ninja 1 --force

Solution 4:^[4]

I had this error while trying to integrate deepspeed library into my training procedure.

sudo apt-get install ninja-build

fixed it for me

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1	Loïc Themyr
Solution 2
Solution 3	Wang
Solution 4	Berkay Berabi

'Ninja is required to load C++ extensions

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Solution 4:[4]

Sources

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