About the `2018-04-27_bottom-up-attention_fixed_36` features

Hi! @Cadene @Hediby
The `.pth` file includes many attributs of image, like:
`'cls_scores', 'rois', 'pooled_feat', 'cls', 'norm_rois'`

- About the 'cls' key, how can you get the class of each roi ?

- And I know the class number is corresbonding to the [https://github.com/peteanderson80/bottom-up-attention/blob/master/data/genome/1600-400-20/objects_vocab.txt](url) Obviously, this dictionary starts from `1` position. I noticed that you also have `0` class number that didn't appear in the dictionary, what's `0` class number stands for?

Hope for your respond!