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In cocoapi:

  File "/home/chenwy/.virtualenvs/torch1.4_py3/lib/python3.6/site-packages/pycocotools/coco.py", line 308, in loadRes
    if type(resFile) == str or type(resFile) == unicode:
NameError: name 'unicode' is not defined

https://stackoverflow.com/questions/19877306/nameerror-global-name-unicode-is-not-defined-in-python-3

Python 3 renamed the unicode type to str, the old str type has been replaced by bytes.

if isinstance(unicode_or_str, str):
    text = unicode_or_str
    decoded = False
else:
    text = unicode_or_str.decode(encoding)
    decoded = True