Comment by Marat_Dukhan

It performs fixed-point arithmetic on 8-bit integers. You can mimick lower than 8-bit precision by using output_min/output_max parameters in XNNPACK operators, but keep in mind that: 1. This functionality is experimental and not exposed in TFLite. You'd need to call XNNPACK APIs directly from C/C++ code. 2. Computations would still be done on 8-bit numbers.