> Why would going back to structure help When your corpus is large it is useful to split it up and hierarchically combine. In their place I would do both botto

> Why would going back to structure help When your corpus is large it is useful to split it up and hierarchically combine. In their place I would do both bottom-up and top-down summarization passes, so information can percolate from a leaf to the root and from the root to a different leaf. Global context can illuminate local summaries, for example think of the twist in a novel, it sheds new light on everything.