Windows Arm Support

[cm4ker]

Hi!

I add Windows ARM support with Copilot help (yea there can be some strange style and logic decigions) and check it on Snapdragon X Elite computer for my little project - it works.

Feel free point me or make changes directly.

Partially close #945

Thank you for this great project and make ML happen on dotnet easy!

[Copilot]

Pull Request Overview

This PR adds Windows ARM64 support to TorchSharp by implementing platform detection, native library loading improvements, and build system modifications to handle ARM64 architecture on Windows.

• Updates runtime identification to detect win-arm64 platform
• Adds explicit dependency chain loading for Windows native libraries
• Includes Windows ARM64-specific LibTorch redistributables and build configurations

Reviewed Changes

Copilot reviewed 12 out of 14 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/TorchSharp/Torch.cs	Updates platform detection and native library loading for ARM64
src/Redist/libtorch-cpu/*.sha	Adds SHA hashes for ARM64 LibTorch redistributables
src/Redist/libtorch-cpu/libtorch-cpu.proj	Defines ARM64-specific DLL dependencies
src/Native/gen-buildsys-win.bat	Adds ARM64 CMake configuration support
src/Native/build.cmd	Enables ARM64 build architecture and removes conditional vcvarsall calls
src/Examples.Utils/Examples.Utils.csproj	Updates ImageSharp package version
pkg/*	Adds ARM64 NuGet package configuration and references
Directory.Build.*	Configures ARM64 build properties and native assembly references

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[Copilot]

The variable isWindows is redeclared here when it's already available from line 129. Consider reusing the existing variable to avoid duplication.

[Copilot]

[nitpick] This package version update appears unrelated to Windows ARM64 support. Consider separating dependency updates into a separate commit to maintain focused changes.

Suggested change

	<PackageReference Include="SixLabors.ImageSharp" Version="3.1.11" />
	<PackageReference Include="SixLabors.ImageSharp" Version="3.1.10" />

[cm4ker]

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[alinpahontu2912]

Hey @cm4ker, huge thanks for the contribution! Have you had a chance to check that these changes still work on other platforms? Is Windows x64 still all good? Our pipelines don’t yet support Windows arm64, but we’re working on upgrading them so we can support the newer releases we've been working on (moving to the latest libtorch + CUDA)
It’s really awesome to see the community so engaged in this project! Please keep sharing your ideas and changes, it really helps us make the case for more resources 😄 . I’ll also give this a try on my arm device. Thanks again, and keep up the amazing work!

[cm4ker]

@alinpahontu2912 Hi! Unfortunately I haven't x64 device and can't check it =(