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build native pack of Torchsharp and libtorch for arm64 ubuntu #1516

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build native pack of Torchsharp and libtorch for arm64 ubuntu#1516
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@abednejad
abednejad
opened on Dec 12, 2025

How to build native pack of Torchsharp and libtorch on arm64 ubuntu 24.04?

sudo apt update
sudo apt install -y git cmake build-essential python3 python3-pip
libopenblas-dev libomp-dev python3.12-dev python3-venv

wget https://dotnet.microsoft.com/download/dotnet/scripts/v1/dotnet-install.sh
chmod +x dotnet-install.sh
./dotnet-install.sh --channel 8.0
export PATH=$PATH:$HOME/.dotnet

git clone --recursive https://github.com/pytorch/pytorch.git
cd pytorch

sudo apt install python3-venv python3-full
python3 -m venv ~/pytorch-env
source ~/pytorch-env/bin/activate

=== 1. Prepare environment ===

sudo apt update

pip install --upgrade pip setuptools wheel
pip install typing_extensions numpy pyyaml
pip install -r requirements.txt

=== 2. Clone PyTorch and install deps ===

git clone --recursive https://github.com/pytorch/pytorch.git
cd pytorch
git checkout 2.7.1

pip install -r requirements.txt

Clean any old build

rm -rf build

=== 3. Build LibTorch for ARM64 ===

tmux new -s pytorch-build

python3 setup.py build | tee build.log

#if ssh closed use this for keept it

  • If SSH disconnects, reconnect and run
    tmux attach -t pytorch-build.

#for detach from tmux
Ctrl + b, then d

#Check logs if needed
tail -f ~/pytorch/build.log

Generate LibTorch dir include bin,lib,share,...

cd /pytorch/build
cmake --install . --prefix ./install

back to root

cd /

=== 4. Clone TorchSharp and integrate LibTorch ===

git clone https://github.com/dotnet/TorchSharp.git
cd TorchSharp

Copy native libs into TorchSharp NativeDependencies

mkdir -p src/NativeDependencies/arm64-linux/libtorch
cp -r /pytorch/build/install/* /TorchSharp/src/Native/NativeDependencies/arm64-linux/libtorch

cd /TorchSharp/src/Native

cmake -DCMAKE_PREFIX_PATH=/TorchSharp/src/Native/NativeDependencies/arm64-linux/libtorch -DCMAKE_BUILD_TYPE=Release

=== 5. link TorchSharp to natively built libtorch ===

how to do that?
how to do that?
I'm stock here!!!!!!!!!

=== 6. Build and pack TorchSharp NuGet ===

dotnet build -c Release
dotnet pack -c Release

I'm stock at step 5 , when going to do step 6, it download libtorch set in
/TorchSharp/src/Redist/libtorch-cpu

and got this error:
build failed with 2 error(s) (0.9s)
collect2 : error : ld returned 1 exit status
/TorchSharp/src/Native/build.proj(40,5): error MSB3073: The command ""/TorchSharp/src/Native/build.sh" --configuration Release --arch arm64 --libtorchpath /TorchSharp/bin/obj/AnyCPU.Release/libtorch-cpu/libtorch-cxx11-abi-shared-with-deps-2.7.1cpu/libtorch/share/cmake/Torch" exited with code 2.

Build failed with 2 error(s) in 4.5s

please help

Please complete the following information:

  • OS: [arm64 ubuntu 24.04
  • Package Type [e.g. torchsharp-cpu-linux, torchsharp-cuda-linux]
  • Version [e.g. 0.105.0]

Activity

  1. abednejad
    added
    questionFurther information is requested
    on Dec 12, 2025

  2. abednejad commented on Dec 13, 2025

    @abednejad
    abednejad
    on Dec 13, 2025
    Author

    anybody can help?

  3. abednejad commented on Dec 14, 2025

    @abednejad
    abednejad
    on Dec 14, 2025
    Author

    finally I found a solution to build native nuget packages for torchsharp on arm64 ubuntu

    here is :

    sudo apt update
    sudo apt install -y git cmake build-essential python3 python3-pip
    libopenblas-dev libomp-dev

    wget https://dotnet.microsoft.com/download/dotnet/scripts/v1/dotnet-install.sh
    chmod +x dotnet-install.sh
    ./dotnet-install.sh --channel 8.0
    export PATH=$PATH:$HOME/.dotnet

    git clone https://github.com/dotnet/TorchSharp.git
    cd TorchSharp

    git clone --recursive https://github.com/pytorch/pytorch.git
    cd pytorch
    git checkout v2.7.1
    git submodule sync
    git submodule update --init --recursive

    sudo apt install python3-venv python3-full
    python3 -m venv ~/pytorch-env
    source ~/pytorch-env/bin/activate

    pip install --upgrade pip setuptools wheel
    pip install typing_extensions numpy pyyaml
    pip install -r requirements.txt

    USE_CUDA=0 USE_AVX=0 USE_AVX2=0 USE_FMA=0 python3 tools/build_libtorch.py

    USE_CUDA=0 python3 tools/build_libtorch.py

    #!/usr/bin/env bash
    set -e

    === 1. Prepare environment ===

    sudo apt update

    sudo apt install -y git cmake ninja-build build-essential python3 python3-venv
    libopenblas-dev libomp-dev

    sudo apt-get update
    sudo apt-get install python3.12-dev

    Create a clean venv

    python3 -m venv ~/pytorch-env
    source ~/pytorch-env/bin/activate

    Upgrade pip/setuptools/wheel

    pip install --upgrade pip setuptools wheel

    === 2. Clone PyTorch and install deps ===

    git clone --recursive https://github.com/pytorch/pytorch.git
    cd pytorch
    pip install -r requirements.txt

    Clean any old build

    rm -rf build

    === 3. Build LibTorch CPU-only for ARM64 ===

    tmux new -s pytorch-build
    #USE_CXX11_ABI=1 USE_CUDA=0 USE_AVX=0 USE_AVX2=0 USE_FMA=0 python3 tools/build_libtorch.py

    #USE_CXX11_ABI=1 USE_CUDA=0 USE_AVX=0 USE_AVX2=0 USE_FMA=0
    #python3 tools/build_libtorch.py | tee build.log

    python3 setup.py build | tee build.log

    #if ssh closed use this for keept it

    • If SSH disconnects, reconnect and run
      tmux attach -t pytorch-build.

    #for detach from tmux
    Ctrl + b, then d

    #Check logs if needed
    tail -f ~/pytorch/build.log

    Generate install dir include bin,lib,share,...

    cd /pytorch/build
    cmake --install . --prefix ./install

    After build, LibTorch will be in pytorch/build/install

    === 4. Clone TorchSharp and integrate LibTorch ===

    cd /
    git clone https://github.com/dotnet/TorchSharp.git
    cd TorchSharp

    Copy native libs into TorchSharp NativeDependencies

    mkdir -p /TorchSharp/src/Native/NativeDependencies/arm64-linux/libtorch
    cp -r /pytorch/build/install/* /TorchSharp/src/Native/NativeDependencies/arm64-linux/libtorch

    LIBTORCH_DIR=/TorchSharp/src/Native/NativeDependencies/arm64-linux/libtorch

    cd /TorchSharp/src/Native

    cmake -DCMAKE_PREFIX_PATH=/TorchSharp/src/Native/NativeDependencies/arm64-linux/libtorch -DCMAKE_BUILD_TYPE=Release

make install

-- Installing: /usr/local/./libLibTorchSharp.so


cp /user/local/libLibTorchSharp.so /TorchSharp/bin/arm64.Release/Native/libLibTorchSharp.so"

    or

    KE_BUILD_TYPE=Release

    or

    # fully recommand this command to build libLibTorchSharp.so and put it into correct dir for project
# this copy build libLibTorchSharp.so to /TorchSharp/bin/arm64.Release/Native

./build.sh --arch arm64 --configuration Release --libtorchpath /TorchSharp/src/Native/NativeDependencies/arm64-linux/libtorch

#for prevent to run /TorchSharp/src/Native/build.sh do these steps
#build.sh using downloaded Library from pytorch and Not your own native build of pytorch
1- comment this lines in /TorchSharp/src/Native/build.proj
   <!-- Run script that invokes Cmake to create VS files, and then calls msbuild to compile them
	<Message Text="$(MSBuildProjectDirectory)\build.cmd $(BuildArgs)" Importance="High"/>
	<Exec Command="&quot;$(MSBuildProjectDirectory)\build.cmd&quot; $(BuildArgs)" />
	-->

2- remove     <PackProject Include="**\TorchAudio.nupkgproj" /> from /TorchSharp/pkg/pack.proj

    === 5. Build and pack TorchSharp NuGet ===

    dotnet build -c Release

    dotnet pack -c Release -p:RuntimeIdentifier=linux-arm64 -p:TargetFramework=net6.0 -p:NoWarn=NU5128 -p:ApiCompatValidateAssemblies=false

    echo "✅ TorchSharp NuGet package built successfully!"
    echo "You can find it under TorchSharp/bin/Release/*.nupkg"

    === 6. remember to copy Native build of Pytorch lib in you build .net project ===

  4. ingted commented on Feb 6, 2026

    @ingted
    ingted
    on Feb 6, 2026

    https://github.com/ingted/TorchSharp_In_DGX_Spark

    I had successfully build it in my DGX Spark box! Thanks @abednejad & Gemini 3 Pro

    The artifacts are here:

    https://github.com/ingted/TorchSharp_In_DGX_Spark/blob/master/TestApp/bin/Release/net8.0/TorchSharp.dll
    https://github.com/ingted/TorchSharp_In_DGX_Spark/blob/master/TestApp/bin/Release/net8.0/libLibTorchSharp.so

  5. ingted commented on Feb 6, 2026

    @ingted
    ingted
    on Feb 6, 2026
    Image

  6. jchristn commented on Jun 18, 2026

    @jchristn
    jchristn
    on Jun 18, 2026

    +1 for needing native support for using TorchSharp on GB10-powered ARM systems (Dell GB10, similar to DGX Spark)

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