Start working on sparse data.

Fix race.

Remove check.

Merge functions.

Cleanup.

Cleanup.

Start writing tests.

Fix.

comp column.

Python test.

lint.

lint.

Fix.

Cleanup.

Avoid binary search.

Use quantile dmatrix by default in sklearn interface.

dask as well.

Fix max_bin.

Fix empty dmatrix for CPU.

Fix GPU version.

Fix empty DMatrix.

pylint.

* Prepare for improving Windows networking compatibility.

* Include dmlc filesystem indirectly as dmlc/filesystem.h includes windows.h, which
  conflicts with winsock2.h
* Define `NOMINMAX` conditionally.
* Link the winsock library when mysys32 is used.
* Add config file for read the doc.

Start working on sparse data.

Fix race.

Remove check.

Merge functions.

Cleanup.

Cleanup.

Start writing tests.

Fix.

comp column.

Python test.

lint.

lint.

Fix.

Cleanup.

Avoid binary search.

Use quantile dmatrix by default in sklearn interface.

dask as well.

Fix max_bin.

Fix empty dmatrix for CPU.

Fix GPU version.

Fix empty DMatrix.

pylint.

…-quantile-dmatrix