Tiny fix: fix preprocess_vimeo90k_dataset.py args name

[hahnjiang]

No description provided.

[innerlee]

Hi, thanks for the contribution! Argparse should support both "a-b" and "a_b", so, does the original code caused any problems?

[hahnjiang]

"a-b" will cause exception.

Traceback (most recent call last):
  File "preprocess_vimeo90k_dataset.py", line 154, in <module>
    generate_anno_file(args.train_list)
AttributeError: 'Namespace' object has no attribute 'train_list'

[innerlee]

What was the shell cmd used?

[hahnjiang]

cmd:

python preprocess_vimeo90k_dataset.py .../mmediting/data/sequences  .../mmediting/data/sequences  .../mmediting/data/sep_trainlist.txt  --make-lmdb

[innerlee]

Thanks! I see. The replacement does not work on positional args.

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@hahnjiang
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