Using models from C# and Java

The main CNTK library is built in Python on top of a C++ core. You can use both C++ and Python to train models. When you want to use your models in production, you have a lot more choice. You can use your trained model from C++ or Python, but most developers will want to use Java or C#. Python is much slower than these languages when it comes to runtime performance. Also, C# and Java are more widely used in corporate environments.

You can download the C# and Java version of CNTK as a separate library from NuGet or Maven central. In Chapter 7, Deploying Models to Production, we'll discuss how to use CNTK from these languages to host a trained model inside a microservice environment.