Question about the refinement and competion

[Remaining]

I have some questions about the input construction.

1. As for the serialization of the refinement, I didn't find where in the code the noise was added for the input labels and bboxes. [In the serialization.py line 402 to 413]

2. Why does each layout input have only one element in the layout completion tasks. [In the serialization.py line 384 to 399]