Some sequences in youtube-vos dataset are filtered out wrongly

[zanglam]

Hi, I found that some sequences in youtube-vos dataset are filtered out wrongly when initializing the data.
In function _init_data in dataset_loaders/ytvos_v2.py, in order to filter out some short sequences, you wrote:

self._viable_seqs = [seq for seq in self._all_seqs if
                             len(self._nonempty_frame_ids[seq]) > 0
                             and len(self.get_image_frame_ids(seq)[min(self._nonempty_frame_ids[seq]) :
                                                                   max(self._visible_objects[seq].keys()) + 1])
                             >= self._seqlen]
print("{} sequences remaining after filtering on length (from first anno obj appearance to last anno frame.".format(len(self._viable_seqs)))

However, in the original youtube-vos dataset, in some cases, the correct length of the sequence can not be obtained using the following code(although it is correct for davis dataset):

len(self.get_image_frame_ids(seq)[min(self._nonempty_frame_ids[seq]) :                                                      
     max(self._visible_objects[seq].keys()) + 1])

For example, for sequence 8be56f165d
self.get_image_frame_ids(seq) is [40, 45, 50, ..., 125, 130, 135]
min(self._nonempty_frame_ids[seq]) is 40
max(self._visible_objects[seq].keys()) + 1 is 136
In this case, I guess you hope to get the length of the list [40, 45, 50, ..., 125, 130, 135], but the function len() will return 0.

[joakimjohnander]

Hey,

Thank you! That is indeed incorrect. I will adress it and update the code.

Best regards,
Joakim

[pytho12]

Is this problem solved now ?

[pytho12]

f you see this message, please reply to me as soon as possible. I really need your help. Thank you very much

[pytho12]

if you see this message, please reply to me as soon as possible. I really need your help. Thank you very much