int8*int8 -> float?

Hey,

I'm looking to perform `int8 * int8 -> fp32`. where at the output stage I dequantise the `int32_t` result into `float` (and then potentially add a bias. I was following the example from https://github.com/google/gemmlowp/blob/master/doc/quantization_example.cc#L305
But it seems that in order to unquantise to `float` you compute the quantisation parameters from the fp32 result that you had already computed before, which in practise I wouldn't know. I can compute it with a compensation factor, but it becomes incredibly complicated and computationally (and memory) expensive. Any alternatives?

If I am able to assume quantisation into `int8` as opposed to `uint8` as in the example, I would be able to have quantisation without the zero_point parameter (assuming zero cantered distribution) which would massively simplify dequantisation. Do you support this? Do you have any examples in the codebase where something like this is done?