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 . Besides , most of the existing multimodal models are pre-trained for understanding task, which leads to a pretrain-finetune discrepency for generation tasks.
before_sent_with_intent: <meaning-changed> With the recent success of  pre-training technique for NLP and image-linguistic tasks, there are still few works on video-linguistic pre-training . Besides , most of the existing multimodal models are pre-trained for understanding task, which leads to a pretrain-finetune discrepency for generation tasks.
after_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 works are gradually developed to improve video-text related downstream tasks. However , most of the existing multimodal models are pre-trained for understanding task, which leads to a pretrain-finetune discrepency for generation tasks.