build native pack of Torchsharp and libtorch for arm64 ubuntu

[abednejad]

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]

[abednejad]

anybody can help?

[abednejad]

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 ===