While TensorFlow can be used on Linux, Windows, Android, macOS, and iOS, it's hard to find cheaper hardware than the $35 Raspberry Pi.

If you have about 10 hours to kill, you can use [Edje Electronics’s] instructions to install TensorFlow on a Raspberry Pi 3. In all fairness, the amount of time you’ll have to babysit i… ...

Raspberry Pi enthusiasts may be interested to know that the Google Machine learning software TensorFlow offering and artificial intelligence framework, will soon be available for the Raspberry Pi.