Train error，maybe something wrong in bounding_box.py
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Description
@mjanusz
Hi, if I used python2.7 I got the same syntax error with https://github.com/google/ffn/issues/19.
And then I transform to python 3.7 I got another new error:
def _required(bbox: Optional[BoundingBox]) -> BoundingBox:
NameError: name 'Optional' is not defined
Is any help for this issue?
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