 Unfortunately, datasets have only limited cross-modal associations: images are not paired with others , captions are only paired with others that describe the same image, there are no negative associations and there are missing positive cross-modal associations.
<clarity>  Unfortunately, datasets have only limited cross-modal associations: images are not paired with others , captions are only paired with others that describe the same image, there are no negative associations and there are missing positive cross-modal associations.
 Unfortunately, datasets have limited cross-modal associations: images are not paired with others , captions are only paired with others that describe the same image, there are no negative associations and there are missing positive cross-modal associations.