<img width="486" alt="new" src="https://github.com/SysCV/transfiner/assets/107290290/37a4b870-dba8-4ab7-9114-979436ad8cb6"> I want to know what kind of Feature fusion operation is done by RoI Feature and Coarse Masks? Where and in what part of the code? Thank you.