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First, install the Reactor Runtime package: 
pip install reactor-runtime
The runtime uses GStreamer as the default WebRTC transport for hardware-accelerated encoding and a wider range of codecs. To enable it, first install the GStreamer system libraries for your platform, then install the Python bindings: 
pip install reactor-runtime[gst]
If GStreamer is not available, the runtime automatically falls back to aiortc, a pure-Python WebRTC implementation that works without any system dependencies. You can always install GStreamer later without changing your model code.
Verify the installation by checking the CLI: 
reactor --help
You should see the available commands including run and init.

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Next

Now that the runtime is installed, learn how models are loaded and how weights stay in memory across sessions:

Model Instancing

How models are loaded and instantiated, with weights staying in memory across sessions.