ML.Net in .NET Framework Project

Sara Lane 1

I have a Windows Forms project that targets the .NET Framework 4.6.1. I'd like to add machine learning capabilities to the project, so I added a new project that implements ML.NET. All of the projects in the solution are targeting x64.

The project works perfectly in the debugger, but I get the following error when I try running the published app:

System.DllNotFoundException
at Microsoft.ML.Internal.CpuMath.Thunk.DotU

I've tried using version 1.3.1 of ML.NET and I also installed Microsoft Visual C++ redistributable in the client machine but same result.

How can I resolve this or do I have no choice but to migrate my whole solution to .NET Core?

Lex Li (Microsoft) 5,662 Reputation points Microsoft Employee

2021-08-05T00:23:40.877+00:00

Please start from posting a complete error message. If System.DllNotFoundException points to CpuMathNative, then it has been thoroughly covered in GitHub issues like this.
Sara Lane 1 Reputation point

2021-08-08T17:44:14.313+00:00

Thank you for taking the time to respond.

It points to CpuMath, not CpuMathNative. I've looked through many similar Github issues but so far none of the solutions have worked for me. Right now I'm using ML.NET version 1.6.0, and everything is targeting x64.

1 answer

Daniel Zhang-MSFT 9,631 Reputation points

2021-08-05T01:53:42.707+00:00
Hi SaraLane-2191,
Please refer to the following suggestions:

Open the package folder on your solution and browse \packages\Microsoft.ML.CpuMath.0.10.0\runtimes\win-x64\native, and copy it to your bin folder.

Use PackageReference instead of packages.config.
More details please refer to this blog.

Include the ML.Net via .csproj file.
And eerhardt has pionted out in this thread.
Best Regards,
Daniel Zhang

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Sara Lane 1 Reputation point

2021-08-08T17:50:17.887+00:00

Hello Mr. Zhang,

Thank you for your response.

I tried your first two suggestions with no success, and I wasn't clear what you meant by the 3rd suggestion. I looked at the link regarding eerhardt but he seems like he's talking about version 1.4.0 of ML.NET, and I'm using version 1.6.0.

I am posting more of the error below (I can't post the whole thing due to character constraints). Thank you for your time!

Application: CentralTest.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.DllNotFoundException
at Microsoft.ML.Internal.CpuMath.Thunk.DotU(Single*, Single*, Int32)
at Microsoft.ML.Numeric.VectorUtils.DotProductWithOffset(Microsoft.ML.Data.VBuffer1<Single> ByRef, Int32, Microsoft.ML.Data.VBuffer1<Single> ByRef)

Exception Info: System.AggregateException
at Microsoft.VisualBasic.CompilerServices.Symbols+Container.InvokeMethod(Method, System.Object[], Boolean[], System.Reflection.BindingFlags)
at Microsoft.VisualBasic.CompilerServices.NewLateBinding.ObjectLateGet(System.Object, System.Type, System.String, System.Object[], System.String[], System.Type[], Boolean[])
at Microsoft.VisualBasic.CompilerServices.NewLateBinding.LateGet(System.Object, System.Type, System.String, System.Object[], System.String[], System.Type[], Boolean[])
at LaborPrediction.LaborModel.PrepareAndTrainModel()
at Central.ProcessCode.Main()

Daniel Zhang-MSFT 9,631 Reputation points

2021-08-09T02:53:28.607+00:00

Hi @Sara Lane ,
>> but he seems like he's talking about version 1.4.0 of ML.NET, and I'm using version 1.6.0.
What he means is that a code example is provided for the 1.4.0 version of ML.NET, you can change it to your own 1.6.0 path.
And do you still get the same error after trying the suggestions?
You can try to use the .NET Framework version 4.7.2 or higher.
Best Regards,
Daniel Zhang

Sara Lane 1 Reputation point

2021-08-19T19:17:33.807+00:00

Hello Mr. Zhang,

I'm sorry for the delayed response. My company performed updates on the network and I was hoping one of the updates would help with this issue but unfortunately that didn't happen.

I've tried all of your suggestions, but I'm still getting the same error.

I'm targeting x64 and .NET Framework 4.5.2 or 4.6.1 (there are 14 projects in the solution). Do they all need to target 4.7.2 for it to work?

Thank you for your help!

Sara Lane 1 Reputation point

2021-08-19T19:19:29.777+00:00

Also please note that this is a ClickOnce app. Could that be affecting things?

Daniel Zhang-MSFT 9,631 Reputation points

2021-08-20T06:34:30.96+00:00

Hi @Sara Lane ,
You can try to use .NET Framework 4.7.2 or higher to rule out the possibility caused by the lower version.
For question about ML.Net, I suggest you ask this question here and you can get more professional answer.
Best Regards,
Daniel Zhang
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