pub fn gemm_assign<T, D, RA, RB, SA, SB, SC>( a: &Matrix<RA, SA, D>, b: &Matrix<RB, SB, D>, c: &Matrix<Ref<&mut T>, SC, D>, alpha: T, beta: T, )where T: Num, D: Device, RA: Repr<Item = T>, RB: Repr<Item = T>, SA: DimTrait, SB: DimTrait, SC: DimTrait,