message: Fixed Error in Conversion from Dense to Sellp.
diff: @@ -396,7 +396,7 @@ void convert_to_sellp(std::shared_ptr<const ReferenceExecutor> exec,
  slice_sets[0] = 0;
  for (size_type slice = 0; slice < slice_num; slice++) {
  if (slice > 0) {
  - slice_sets[slice] = slice_lengths[slice - 1];
  + slice_sets[slice] = slice_sets[slice - 1] + slice_lengths[slice - 1];
  }
  slice_lengths[slice] = 0;
  for (size_type row = 0; row < slice_size; row++) {
  @@ -437,7 +437,7 @@ void convert_to_sellp(std::shared_ptr<const ReferenceExecutor> exec,
  }
  }
  }
  - slice_sets[slice_num] = slice_lengths[slice_num - 1];
  + slice_sets[slice_num] = slice_sets[slice_num - 1] + slice_lengths[slice_num - 1];
  }
  GKO_INSTANTIATE_FOR_EACH_VALUE_AND_INDEX_TYPE(
  