PrepareBias is really hard to use

[kpu]

If there's only one choice of Callback, don't make it a template argument. Why would anybody want to provide something other than 1?

[kpu]

Also this shouldn't depend on the number of rows in A, right?

[XapaJIaMnu]

So, I saw you fixed it already. Question: We only support Biases that are the shape 1xcolsB. We do not support biases that are the full shape of the C matrix, like BLAS?

[kpu]

I guess it is called intgemm...