pub fn spsm_buffer_size<T: SparseScalar>( handle: &Handle, op_a: Op, op_b: Op, alpha: &T, a: &SpMat<'_, T>, b: &DnMat<'_, T>, c: &DnMat<'_, T>, alg: SpSMAlg, plan: &SpSMPlan, ) -> Result<usize>