Cannot run `bash run_smth_i3d.sh` because `batch[2]` is not accessible.

[kylemin]

When I enumerate over val_loader, the length of batch is 2 (batch[0] is an input clip and batch[1] is a target label).
In your batch_fn, however, you access batch[2] to get item_id.
It makes an IndexError as below.

[xiaofanustc]

Hello, batch[2] is not accessible since the default setting in gluoncv loader is that it only returns 2 variables: the data and label, you need to change the default setting and add the id of each video in returned variables.

[kylemin]

Hi again,
I am wondering how I can change the default setting to make the loader return three variables.

[xiaofanustc]

Hello, 1. find the path you install gluoncv. 2. change the returned variable in function getitem() in https://github.com/dmlc/gluon-cv/blob/master/gluoncv/data/video_custom/classification.py as "nd.array(clip_input), target, int(directory.split('/')[-1]) ". This variable is used for giving the path to save corresponding adversarial frames and you can also eliminate the variable in the code.

[xiaofanustc]

The gluoncv code now is slightly different from what I used before. You can have a try as I said above and feel free to ask me at any time if there are any other problems. Thank you.