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Yes there are, IMSL and AleaGPU for starters.

https://www.roguewave.com/products-services/imsl-numerical-l...

http://www.quantalea.com/

.NET is used a lot for data analysis in life sciences, as most laboratory devices only expose COM and .dll interfaces.

Specially for stuff like DNA sequencing, chemical structure manipulation, reaction curves analysis and such.

This is not my field, but I have used Accord.NET (http://accord-framework.net/) while learning machine learning and have no complaints, but also have little room for comparison. Any C++ library you'd consider as definitive, for some basis to compare? One other thing is that running C++ libraries in C# is, in most cases, quite trivial.

It's probably more common for data scientists in the .NET world to use F#. FsLab (https://fslab.org/) seems cool from some limited experimentation (disclaimer: I'm not a data scientist, but am data curious).