There's an explanation here: https://stackoverflow.com/questions/47220595/why-the-6-in-relu6 https://stackoverflow.com/questions/47220595/why-the-6-in-re... I

There's an explanation here: https://stackoverflow.com/questions/47220595/why-the-6-in-relu6 https://stackoverflow.com/questions/47220595/why-the-6-in-re... It's an arbitrary value, but 6 fits best into 8 bits.