message: reverted changes in count_nnz_per_row
diff: @@ -836,7 +836,8 @@ namespace kernel {
  template <typename Operator, typename ValueType>
  __device__ void reduce_array(size_type size,
  const ValueType *__restrict__ source,
  - ValueType *__restrict__ result, Operator reduce_op)
  + ValueType *__restrict__ result,
  + Operator reduce_op = Operator{})
  {
  const auto tidx = threadIdx.x + blockIdx.x * blockDim.x;
  auto thread_result = zero<ValueType>();
  