[backport][EM] Disable the on_host option for CPU inputs. (dmlc#11333) (dmlc#11334)

Author: trivialfis

src/data/sparse_page_dmatrix.cc

@@ -105,7 +105,7 @@ BatchSet<SparsePage> SparsePageDMatrix::GetRowBatches() {
 }
 
 BatchSet<CSCPage> SparsePageDMatrix::GetColumnBatches(Context const *ctx) {
-  auto id = MakeCache(this, ".col.page", on_host_, cache_prefix_, &cache_info_);
+  auto id = MakeCache(this, ".col.page", false, cache_prefix_, &cache_info_);
   CHECK_NE(this->Info().num_col_, 0);
   this->InitializeSparsePage(ctx);
   if (!column_source_) {
@@ -119,7 +119,7 @@ BatchSet<CSCPage> SparsePageDMatrix::GetColumnBatches(Context const *ctx) {
 }
 
 BatchSet<SortedCSCPage> SparsePageDMatrix::GetSortedColumnBatches(Context const *ctx) {
-  auto id = MakeCache(this, ".sorted.col.page", on_host_, cache_prefix_, &cache_info_);
+  auto id = MakeCache(this, ".sorted.col.page", false, cache_prefix_, &cache_info_);
   CHECK_NE(this->Info().num_col_, 0);
   this->InitializeSparsePage(ctx);
   if (!sorted_column_source_) {
@@ -138,11 +138,11 @@ BatchSet<GHistIndexMatrix> SparsePageDMatrix::GetGradientIndex(Context const *ct
     CHECK_GE(param.max_bin, 2);
   }
   detail::CheckEmpty(batch_param_, param);
-  auto id = MakeCache(this, ".gradient_index.page", on_host_, cache_prefix_, &cache_info_);
+  auto id = MakeCache(this, ".gradient_index.page", false, cache_prefix_, &cache_info_);
   if (!cache_info_.at(id)->written || detail::RegenGHist(batch_param_, param)) {
     this->InitializeSparsePage(ctx);
     cache_info_.erase(id);
-    id = MakeCache(this, ".gradient_index.page", on_host_, cache_prefix_, &cache_info_);
+    id = MakeCache(this, ".gradient_index.page", false, cache_prefix_, &cache_info_);
     LOG(INFO) << "Generating new Gradient Index.";
     // Use sorted sketch for approx.
     auto sorted_sketch = param.regen;