Reading the pytorch documentation about faster RCNN  from this page 2, It says that the input to the model during training is a list of dictionaries with the keys as ‘boxes’, ‘labels’.
However, when reading the fine tuning tutorial for faster r-cnn 1, there are additional arguments defined such as the ‘image_id’, ‘area’ and ‘iscrowd’ keys.
The documentation does not mention any of those keys. How do we resolve this discrepancy?