before_sent:  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: <fluency>  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:  Besides , most of the existing multimodal models are pre-trained for understanding tasks, leading to a pretrain-finetune discrepency for generation tasks.