Change fake tqdm constructor to match real tqdm (#17636)
Summary:
Currently, the fake tqdm implementation requires an input (whereas real tqdm does not).
This caused a problem in torchvision (https://github.com/pytorch/vision/pull/770), and seems likely to cause minor irritations elsewhere.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/17636
Differential Revision: D14296530
Pulled By: ezyang
fbshipit-source-id: bc077d898773c93dab34c985a7b30525a43e558a
