Before revision: Summarizing a document within an allocated budget while maintaining its major concepts is a challenging task . If the budget can take any arbitrary value and not known beforehand , it becomes even more difficult.
After revision: Summarizing a document within an allocated budget while maintaining its major concepts is a challenging task in natural language processing. It is even more challenging for domains where limited training data is available or scenarios in which the length of the summary is not known beforehand , it becomes even more difficult.