Rong Ou 5b1715d97c Write ELLPACK pages to disk (#4879)
* add ellpack source
* add batch param
* extract function to parse cache info
* construct ellpack info separately
* push batch to ellpack page
* write ellpack page.
* make sparse page source reusable
2019-10-22 23:44:32 -04:00
..
2019-08-19 16:51:40 +12:00