BugFix: Hierarchical Fed Stats, prepare data: replace os.rename() function

[chesterxgchen]

Fixes # .replace os.rename() to shutil.move() to avoid os.error when destination and src are in different mnt or devices

Types of changes

• [x] Non-breaking change (fix or new feature that would not break existing functionality).
• [ ] Breaking change (fix or new feature that would cause existing functionality to change).
• [ ] New tests added to cover the changes.
• [ ] Quick tests passed locally by running ./runtest.sh.
• [ ] In-line docstrings updated.
• [ ] Documentation updated.

[chesterxgchen]

os.rename doesn't work across filesystems while shutl.move does. However, why we need to write a csv file then move it. Can we write it directly to dataset_path/university-N/university-N.csv?

Good point, this is someone else code, I did not pay attention and only fixed the QA reported error. Let me change it

[chesterxgchen]

/build

[chesterxgchen]

/build