before_sent: With the recent success of  pre-training technique for NLP and image-linguistic tasks, there are still few works on video-linguistic pre-training .
before_sent_with_intent: <coherence> With the recent success of  pre-training technique for NLP and image-linguistic tasks, there are still few works on video-linguistic pre-training .
after_sent: With the recent success of the pre-training technique for NLP and image-linguistic tasks, there are still few works on video-linguistic pre-training .