Thanks for releasing code, but I found there may exist some bugs when loading features from the h5 file.
In line 208 and 209 of dataset.py, we can see that the features are loaded every 5 frames (self.video_skipframes=5 for thumos)
https://github.com/Frostinassiky/gtad/blob/f4677a2fd8fda0f990e0c05687b07eed24de5688/gtad_lib/dataset.py#L208
https://github.com/Frostinassiky/gtad/blob/f4677a2fd8fda0f990e0c05687b07eed24de5688/gtad_lib/dataset.py#L209
The start frame of the loaded sequence should be 0 (idx=0).

But in line 221, the snippet index starts from #start_snippet=3#.
https://github.com/Frostinassiky/gtad/blob/f4677a2fd8fda0f990e0c05687b07eed24de5688/gtad_lib/dataset.py#L221

Then, after calculating, we can find the anchor region related the first timestamp in the sequence will be [0.5, 5.5].
https://github.com/Frostinassiky/gtad/blob/f4677a2fd8fda0f990e0c05687b07eed24de5688/gtad_lib/dataset.py#L241
https://github.com/Frostinassiky/gtad/blob/f4677a2fd8fda0f990e0c05687b07eed24de5688/gtad_lib/dataset.py#L242
But when you calculate the start region and the end region related to the ground truth box, these seems no such shift along the temporal dimension:

https://github.com/Frostinassiky/gtad/blob/f4677a2fd8fda0f990e0c05687b07eed24de5688/gtad_lib/dataset.py#L137
https://github.com/Frostinassiky/gtad/blob/f4677a2fd8fda0f990e0c05687b07eed24de5688/gtad_lib/dataset.py#L138