Typo in the download_tool.py file

[jwkweon]

Hi, I have identified a minor typo in the download_tool.py file of the project. The error can be found at line 352, where "set" is mistakenly used instead of "set_".

gnr/genebody/download_tool.py

Line 352 in bb3ff23

subsets = [set_ for set_ in ['test10', 'train40', 'smpl_depth', 'pretrained_models'] if set in args.subset]

When executing the code, it produces the following error:
>>> TypeError: 'in <string>' requires string as left operand, not type.

So, I kindly suggest rectifying the typo by replacing "set" with "set_" in the download_tool.py file.

Thank you.