RuntimeError: Ninja is required to load C++ extensions

[pin-xue-lou]

When I use Qpytorch, it reports the following error: RuntimeError: Ninja is required to load C++ extensions. However, I have already installed Ninja, how can I solve this problem?

[aimilefth]

I have the same issue, after using pip install ninja

[aimilefth]

Using apt install ninja-build fixed the problem for me

Here is the Dockerfile, from which I can run qtorch successfully

FROM nvidia/cuda:11.4.3-base-ubuntu20.04

WORKDIR /app

RUN apt-get update && \
    apt-get install -y \
        python3-pip \
        ninja-build 
        # Ninja is QPyTorch requirement
        # libglib2.0-0

RUN pip install torch==1.13.1+cu117 -f https://download.pytorch.org/whl/torch_stable.html
RUN pip install notebook

COPY requirements.txt .
RUN pip install -r requirements.txt

The requirements.txt file is the following

imbalanced_learn==0.12.0
matplotlib==3.7.3
numpy==1.23.5
pandas==2.0.3
plotly==5.19.0
scikit_learn==1.2.2
streamlit==1.33.0
tqdm==4.66.2
torchinfo
# QPyTorch requirements
sphinx>=1.4
ipykernel
nbsphinx
qtorch

Not all packages and libraries of the Dockerfile/requirements.txt are needed to run qtorch, but this is the environment that I used.