[SOLVED] How to install Infer.NET to Unity 2018.3

Unity Engine
1

I have a fresh Unity project and following the instructions in Using .NET 4.x in Unity, i’ve downloaded Microsoft.ML.Probabilistic.Compiler NuGet package from the gallery and copied the DLL to Assets/Plugins. After this Unity outputs an error message

Assembly ‘Assets/Plugins/Microsoft.ML.Probabilistic.Compiler.dll’ will not be loaded due to errors: Unable to resolve reference ‘Microsoft.ML.Probabilistic’. Is the assembly missing or incompatible with the current platform?

I downloaded and copied the missing DLL and every following missing DLL dependency

  • Microsoft.ML.Probabilistic.dll
  • System.CodeDom.dll
  • Microsoft.CodeAnalysis.CSharp.dll
  • Microsoft.CodeAnalysis.dll
  • System.Collections.Immutable.dll
  • System.Reflection.Metadata.dll

Unity showed no more errors after adding the System.Reflection.Metadata.dll.

When i add

using Microsoft.ML.Probabilistic;
using Microsoft.ML.Probabilistic.Compiler;

to a script, the project builds fine in both Unity and Visual Studio Community, but when i attempt to use the libraries

using UnityEngine;
using Microsoft.ML.Probabilistic;
using Microsoft.ML.Probabilistic.Compiler;

public class Main : MonoBehaviour {
    void Start () {
        Variable<bool> firstCoin = Variable.Bernoulli (0.5);
    }
}

both Unity and Visual Studio fail with

Assets/Scripts/Main.cs(7,3): error CS0246: The type or namespace name ‘Variable<>’ could not be found (are you missing a using directive or an assembly reference?)

and

Assets/Scripts/Main.cs(7,30): error CS0103: The name ‘Variable’ does not exist in the current context

Adding -r:Microsoft.ML.Probabilistic.Compiler.dll to Assets/mcs.rsp file generates an error

Microsoft (R) Visual C# Compiler version 2.9.1.65535 (9d34608e)
Copyright (C) Microsoft Corporation. All rights reserved.
error CS0006: Metadata file ‘Microsoft.ML.Probabilistic.Compiler.dll’ could not be found

The project configuration is

  • Unity 2018.3.10f1
  • Visual Studio for Mac Community
  • Build Settings/Platform: iOS
  • Player Settings/Scripting Runtime Version: .NET 4.x Equivalent

it makes no difference whether i set

  • Player Settings/Api Compatibility Level: .NET 4.x

or

  • Player Settings/Api Compatibility Level: .NET Standard 2.0

Other settings are left to their defaults.

I haven’t added the DLLs to the vs-project in Visual Studio as the guide says

Visual Studio regenerates .csproj and .sln files for Unity projects each time they’re opened. As a result, you cannot add assembly references directly in Visual Studio because they’ll be lost upon reopening the project. Instead, a special text file named mcs.rsp must be used:
Create a new text file named mcs.rsp in your Unity project’s root Assets directory.
On the first line in the empty text file, enter: -r:System.Net.Http.dll and then save the file. You can replace “System.Net.Http.dll” with any included assembly that might be missing a reference.
Restart the Unity editor.

This is a cross post with my Stack Overflow question that i’ve received no answers
https://stackoverflow.com/questions/56019411/how-to-install-infer-net-to-unity-2018-3

I would love to use this library and would appreciate any help you can offer.

2

Hmm… no replies. Help me out if you know a better subforum for this kind of question. Not exactly sure this is a question for External Tools.

3

For anyone interested, the above installation actually works, i was just missing the fact that the Variable is in the Microsoft.ML.Probabilistic.Models namespace. FYI: The library doesn’t support AOT so it won’t work on iOS.