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Author SHA1 Message Date
Kodi Arfer f2277e7106 Use DART tree weights when computing SHAPs (#5050) 
This PR fixes tree weights in dart being ignored when computing contributions.

* Fix ellpack page source link.
* Add tree weights to compute contribution.
 2019-12-03 19:55:53 +08:00
Kodi Arfer 6a569b8cd9 Avoid generating NaNs in UnwoundPathSum (#3943) 
* Avoid generating NaNs in UnwoundPathSum.

Kudos to Jakub Zakrzewski for tracking down the bug.

* Add a test
 2019-01-03 15:04:46 -08:00