About roll angle rectify after image flipping

Hello,

I noticed that in [line 159](https://github.com/facebookresearch/OrienterNet/blob/c222d08c9c0a084d79a415cc5c43e71173d2ecc4/maploc/data/dataset.py#L159), you employed random flipping to augment the query and map images, and later, in [line 164](https://github.com/facebookresearch/OrienterNet/blob/c222d08c9c0a084d79a415cc5c43e71173d2ecc4/maploc/data/dataset.py#L164), the query image are rectified by setting the roll and pitch angles to zero. However, I'm wondering if a negative sign should be applied to the [roll](https://github.com/facebookresearch/OrienterNet/blob/c222d08c9c0a084d79a415cc5c43e71173d2ecc4/maploc/data/dataset.py#L214) angle during the rectification process after the images have been flipped.

I'm quite new to this area, thank you for your attention to this detail!