Here is a USB device that lets you try machine learning inferencing on Raspberry Pi and other Linux systems. The Coral USB Accelerator has an on-board Edge TPU Coprocessor that can perform 4 trillion operations per second. It can execute mobile vision models such as mobilenet V2 at 400 fps.
The Coral USB Accelerator works with Debian Linux systems. It supports TensorFlow Lite and AutoML Vision Edge.