Basically, we can regard the “summarization” as the “function” its input is document and output is summary.
There are mainly two ways to make the summary. Extractive and Abstractive.
- Extractive: It involves the selection of phrases and sentences from the source document to make up the new summary.
- Abstractive: It involves generating entirely new phrases and sentences to capture the meaning of the source document.
Extractive & Abstractive is not conflicting ways. You can use both to generate the summary. Here we cover extractive methods and, in particular, the TextRank algorithm.