before_sent:  We pre-train ProphetNet using a base scale dataset (16GB) and a large scale dataset (160GB)  respectively.
before_sent_with_intent: <fluency>  We pre-train ProphetNet using a base scale dataset (16GB) and a large scale dataset (160GB)  respectively.
after_sent:  We pre-train ProphetNet using a base scale dataset (16GB) and a large-scale dataset (160GB) respectively.