Optional by-column histogram build. (#8233)

Co-authored-by: dmitry.razdoburdin <drazdobu@jfldaal005.jf.intel.com>
2022-09-21 23:16:13 +02:00
parent b791446623
commit eb7bbee2c9
5 changed files with 152 additions and 70 deletions
--- a/src/common/hist_util.h
+++ b/src/common/hist_util.h
@@ -623,7 +623,8 @@ class GHistBuilder {
  // construct a histogram via histogram aggregation
  template <bool any_missing>
  void BuildHist(const std::vector<GradientPair>& gpair, const RowSetCollection::Elem row_indices,
-                 const GHistIndexMatrix& gmat, GHistRow hist) const;
+                 const GHistIndexMatrix& gmat, GHistRow hist,
+                 bool force_read_by_column = false) const;
  uint32_t GetNumBins() const {
      return nbins_;
  }