Jiaming Yuan 14c56f05da
[backport] Handle missing values in dataframe with category dtype. (#7331) (#7413)
* Handle missing values in dataframe with category dtype. (#7331)

* Replace -1 in pandas initializer.
* Unify `IsValid` functor.
* Mimic pandas data handling in cuDF glue code.
* Check invalid categories.
* Fix DDM sketching.

* Fix pick error.
2021-11-10 21:24:46 +08:00
..
2021-08-03 11:51:56 +08:00
2021-04-30 09:03:12 +08:00