.NET machine learning library

Are there any good machine learning libraries for .NET that may make it an alternative to Python and R?  I've heard of ML.NET, but am not sure how good it is and how committed Microsoft are to it.
AlHal2Asked:
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Kyle AbrahamsSenior .Net DeveloperCommented:
ML .Net seems interesting but machine learning boils down to building neural networks, which can be done in C#.  

It looks like ML .Net is building classes around basic neural network concepts to help people build their own.

I've also seen The Cognitive Toolkit (Microsoft) Recommended:
https://www.microsoft.com/en-us/cognitive-toolkit/

TensorFlow (Google)
https://github.com/migueldeicaza/TensorFlowSharp


And Accord:
http://accord-framework.net/intro.html

just to name a few.
AlHal2Author Commented:
Just to check.  Can one build neural networks in C#.  Not sure if there is a typo.  Is it possible to upgrade .NET software to use the cognitive toolkit?
Kyle AbrahamsSenior .Net DeveloperCommented:
You can definitely build neural networks with C#.

You can use .Net to use the toolkit:
https://docs.microsoft.com/en-us/cognitive-toolkit/using-cntk-with-csharp
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AlHal2Author Commented:
Why isn't C# used more widely for artificial intelligence and machine learning.
I'm a C# programmer who knows a tiny bit of Python and am considering working in AI.
Is it worth pursuing it in C# or do I need to do more Python?  I've never used R.
Kyle AbrahamsSenior .Net DeveloperCommented:
Don't really know the answer to the first question but I'm considering building one myself and am looking to do it in C#.  Why learn a new language when the one you're strong in can do what you want?

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AlHal2Author Commented:
Thanks.
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