'pixel_mask': tensor([[1, 1, 1,  , 1, 1, 1],
         [1, 1, 1,  , 1, 1, 1],
         [1, 1, 1,  , 1, 1, 1],
         ,
         [1, 1, 1,  , 1, 1, 1],
         [1, 1, 1,  , 1, 1, 1],
         [1, 1, 1,  , 1, 1, 1]]),
 'labels': {'size': tensor([800, 800]), 'image_id': tensor([756]), 'class_labels': tensor([4]), 'boxes': tensor([[0.7340, 0.6986, 0.3414, 0.5944]]), 'area': tensor([519544.4375]), 'iscrowd': tensor([0]), 'orig_size': tensor([480, 480])}}