Handle the new device parameter in dask and demos. (#9386)

* Handle the new `device` parameter in dask and demos.

- Check no ordinal is specified in the dask interface.
- Update demos.
- Update dask doc.
- Update the condition for QDM.

src/c_api/c_api.cc

@@ -81,13 +81,6 @@ void XGBBuildInfoDevice(Json *p_info) {
 }  // namespace xgboost
 #endif
 
-namespace {
-void DeprecatedFunc(StringView old, StringView since, StringView replacement) {
-  LOG(WARNING) << "`" << old << "` is deprecated since" << since << ", use `" << replacement
-               << "` instead.";
-}
-}  // anonymous namespace
-
 XGB_DLL int XGBuildInfo(char const **out) {
   API_BEGIN();
   xgboost_CHECK_C_ARG_PTR(out);
@@ -328,7 +321,7 @@ XGB_DLL int XGDeviceQuantileDMatrixCreateFromCallback(DataIterHandle iter, DMatr
                                                       int nthread, int max_bin,
                                                       DMatrixHandle *out) {
   API_BEGIN();
-  DeprecatedFunc(__func__, "1.7.0", "XGQuantileDMatrixCreateFromCallback");
+  LOG(WARNING) << error::DeprecatedFunc(__func__, "1.7.0", "XGQuantileDMatrixCreateFromCallback");
   *out = new std::shared_ptr<xgboost::DMatrix>{
       xgboost::DMatrix::Create(iter, proxy, nullptr, reset, next, missing, nthread, max_bin)};
   API_END();
@@ -432,7 +425,7 @@ XGB_DLL int XGDMatrixCreateFromCSREx(const size_t *indptr, const unsigned *indic
                                      const bst_float *data, size_t nindptr, size_t nelem,
                                      size_t num_col, DMatrixHandle *out) {
   API_BEGIN();
-  DeprecatedFunc(__func__, "2.0.0", "XGDMatrixCreateFromCSR");
+  LOG(WARNING) << error::DeprecatedFunc(__func__, "2.0.0", "XGDMatrixCreateFromCSR");
   data::CSRAdapter adapter(indptr, indices, data, nindptr - 1, nelem, num_col);
   *out = new std::shared_ptr<DMatrix>(DMatrix::Create(&adapter, std::nan(""), 1));
   API_END();
@@ -496,7 +489,7 @@ XGB_DLL int XGDMatrixCreateFromCSCEx(const size_t *col_ptr, const unsigned *indi
                                      const bst_float *data, size_t nindptr, size_t, size_t num_row,
                                      DMatrixHandle *out) {
   API_BEGIN();
-  DeprecatedFunc(__func__, "2.0.0", "XGDMatrixCreateFromCSC");
+  LOG(WARNING) << error::DeprecatedFunc(__func__, "2.0.0", "XGDMatrixCreateFromCSC");
   data::CSCAdapter adapter(col_ptr, indices, data, nindptr - 1, num_row);
   xgboost_CHECK_C_ARG_PTR(out);
   *out = new std::shared_ptr<DMatrix>(DMatrix::Create(&adapter, std::nan(""), 1));
@@ -1347,7 +1340,7 @@ XGB_DLL int XGBoosterGetModelRaw(BoosterHandle handle, xgboost::bst_ulong *out_l
   raw_str.resize(0);
 
   common::MemoryBufferStream fo(&raw_str);
-  DeprecatedFunc(__func__, "1.6.0", "XGBoosterSaveModelToBuffer");
+  LOG(WARNING) << error::DeprecatedFunc(__func__, "1.6.0", "XGBoosterSaveModelToBuffer");
 
   learner->Configure();
   learner->SaveModel(&fo);

src/common/error_msg.cc

@@ -3,10 +3,18 @@
  */
 #include "error_msg.h"
 
+#include <sstream>  // for stringstream
+
 #include "../collective/communicator-inl.h"  // for GetRank
 #include "xgboost/logging.h"
 
 namespace xgboost::error {
+std::string DeprecatedFunc(StringView old, StringView since, StringView replacement) {
+  std::stringstream ss;
+  ss << "`" << old << "` is deprecated since" << since << ", use `" << replacement << "` instead.";
+  return ss.str();
+}
+
 void WarnDeprecatedGPUHist() {
   auto msg =
       "The tree method `gpu_hist` is deprecated since 2.0.0. To use GPU training, set the `device` "
@@ -34,8 +42,9 @@ void WarnDeprecatedGPUId() {
   if (logged) {
     return;
   }
-  LOG(WARNING) << "`gpu_id` is deprecated in favor of the new `device` parameter: "
-               << "device = cpu/cuda/cuda:0";
+  auto msg = DeprecatedFunc("gpu_id", "2.0.0", "device");
+  msg += " E.g. device=cpu/cuda/cuda:0";
+  LOG(WARNING) << msg;
   logged = true;
 }
 

src/common/error_msg.h

@@ -8,6 +8,7 @@
 
 #include <cinttypes>  // for uint64_t
 #include <limits>     // for numeric_limits
+#include <string>     // for string
 
 #include "xgboost/base.h"  // for bst_feature_t
 #include "xgboost/logging.h"
@@ -86,5 +87,7 @@ void WarnManualUpdater();
 void WarnDeprecatedGPUId();
 
 void WarnEmptyDataset();
+
+std::string DeprecatedFunc(StringView old, StringView since, StringView replacement);
 }  // namespace xgboost::error
 #endif  // XGBOOST_COMMON_ERROR_MSG_H_

src/learner.cc

@@ -690,19 +690,20 @@ class LearnerConfiguration : public Learner {
       stack.pop();
       auto const &obj = get<Object const>(j_obj);
 
-      for (auto const &kv : obj) {
+      for (auto const& kv : obj) {
         if (is_parameter(kv.first)) {
           auto parameter = get<Object const>(kv.second);
-          std::transform(parameter.begin(), parameter.end(), std::back_inserter(keys),
-                         [](std::pair<std::string const&, Json const&> const& kv) {
-                           return kv.first;
-                         });
+          std::transform(
+              parameter.begin(), parameter.end(), std::back_inserter(keys),
+              [](std::pair<std::string const&, Json const&> const& kv) { return kv.first; });
         } else if (IsA<Object>(kv.second)) {
           stack.push(kv.second);
-        } else if (kv.first == "metrics") {
+        } else if (IsA<Array>(kv.second)) {
           auto const& array = get<Array const>(kv.second);
           for (auto const& v : array) {
-            stack.push(v);
+            if (IsA<Object>(v) || IsA<Array>(v)) {
+              stack.push(v);
+            }
           }
         }
       }