P/Invoke bindings for DLPack. It demonstrates consuming from C# a DLPack tensor produced in a C function.

Hopefully there will be official bindings: dmlc/dlpack#56 and microsoft/onnxruntime#4162.

Currently there is no example for constructing a DLPack tensor in C# and sending it to a C function.

Limitations: due to ReadOnlySpan<T> supporting only Int32 lengths, the ROS<T>-returning method is called DataSpanLessThan2Gb(). Issues: dotnet/corefxlab#896 and https://github.com/dotnet/apireviews/tree/master/2016/11-04-SpanOfT#spant-and-64-bit. This code assumes Linux, but could be made to work on Windows with a different Makefile.

More advanced example with libtorch (using the same dlpack.cs: https://github.com/vadimkantorov/dotnetlibtorch

Install .NET Core 3.1 SDK on Ubuntu 18.04

From https://docs.microsoft.com/en-us/dotnet/core/install/linux-ubuntu#1804- :

wget https://packages.microsoft.com/config/ubuntu/18.04/packages-microsoft-prod.deb -O packages-microsoft-prod.deb
sudo dpkg -i packages-microsoft-prod.deb

sudo apt-get update
sudo apt-get install -y apt-transport-https
sudo apt-get update 
sudo apt-get install -y dotnet-sdk-3.1

Usage

make dlpack
./dlpack golden.bin

make libdlpack.so
dotnet run test.cs csharp.bin

#ndim 2
#shape 3 2
#(0, 0) = 0
#(0, 1) = 1
#(1, 0) = 2
#(1, 1) = 3
#(2, 0) = 4
#(2, 1) = 5
#Deleter calling
#Deleter called

diff golden.bin csharp.bin