[Fix] Fix folder creation in preprocess_df2k_ost_dataset.py #623
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Motivation
As mentioned in #620, the current version induces error when creating folder for the images, due to the duplicate of
mmcv.mkdir_or_exist
andos.makedirs
.Modification
This PR changes
mmcv.mkdir_or_exist
toosp.exists
, so that no folder is created as inmmcv.mkdir_or_exist
.