message: remove additional threads from sequential code
diff: @@ -220,10 +220,6 @@ __global__ void find_natural_blocks_kernel3(size_type num_rows,
  IndexType *block_ptrs,
  size_type *num_blocks_arr)
  {
  - size_type tidx = blockDim.x * blockIdx.x + threadIdx.x;
  - if (tidx >= 1) {
  - return;
  - }
  block_ptrs[0] = 0;
  if (num_rows == 0) {
  return;
  @@ -281,7 +277,7 @@ size_type find_natural_blocks(std::shared_ptr<const GpuExecutor> exec,
  const int64 dimgrid2_2 = ceildiv(mtx->get_num_rows(), dimgrid2_1);
  const int64 dimgrid2_3 = 1;
  - constexpr int64 blocksize3_1 = 32;
  + constexpr int64 blocksize3_1 = 1;
  constexpr int64 blocksize3_2 = 1;
  constexpr int64 blocksize3_3 = 1;
  @@ -323,10 +319,6 @@ __global__ void agglomerate_supervariables_kernel(int32 max_block_size,
  IndexType *block_ptrs,
  size_type *num_blocks_arr)
  {
  - size_type tidx = blockDim.x * blockIdx.x + threadIdx.x;
  - if (tidx >= 1) {
  - return;
  - }
  num_blocks_arr[0] = 0;
  if (num_natural_blocks == 0) {
  return;
  @@ -359,7 +351,7 @@ inline size_type agglomerate_supervariables(
  Array<size_type> nums_array(exec->get_master(), 1);
  auto nums = nums_array.get_data();
  - constexpr int64 blocksize1_1 = 32;
  + constexpr int64 blocksize1_1 = 1;
  constexpr int64 blocksize1_2 = 1;
  constexpr int64 blocksize1_3 = 1;
  