xgboost_lib-sys 3.0.5

Native bindings to the xgboost library
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/*!
 * Copyright 2018-2023 XGBoost contributors
 */
#include <xgboost/objective.h>
#include <xgboost/context.h>
#include "../../src/common/common.h"
#include "../helpers.h"
#include "test_multiclass_obj.h"

namespace xgboost {

void TestSoftmaxMultiClassObjGPair(const Context* ctx) {
  std::vector<std::pair<std::string, std::string>> args {{"num_class", "3"}};
  std::unique_ptr<ObjFunction> obj {
    ObjFunction::Create("multi:softmax", ctx)
  };

  obj->Configure(args);
  CheckConfigReload(obj, "multi:softmax");

  CheckObjFunction(obj,
		   {1.0f, 0.0f, 2.0f, 2.0f, 0.0f, 1.0f}, // preds
		   {1.0f, 0.0f},	       // labels
		   {1.0f, 1.0f},	       // weights
		   {0.24f, -0.91f, 0.66f, -0.33f, 0.09f, 0.24f}, // grad
		   {0.36f, 0.16f, 0.44f, 0.45f, 0.16f, 0.37f});	 // hess

  CheckObjFunction(obj,
		   {1.0f, 0.0f, 2.0f, 2.0f, 0.0f, 1.0f}, // preds
		   {1.0f, 0.0f},	       // labels
                   {},                         // weights
		   {0.24f, -0.91f, 0.66f, -0.33f, 0.09f, 0.24f}, // grad
		   {0.36f, 0.16f, 0.44f, 0.45f, 0.16f, 0.37f});	 // hess

  ASSERT_NO_THROW(obj->DefaultEvalMetric());
}

void TestSoftmaxMultiClassBasic(const Context* ctx) {
  std::vector<std::pair<std::string, std::string>> args{
      std::pair<std::string, std::string>("num_class", "3")};

  std::unique_ptr<ObjFunction> obj{ObjFunction::Create("multi:softmax", ctx)};
  obj->Configure(args);
  CheckConfigReload(obj, "multi:softmax");

  HostDeviceVector<bst_float>  io_preds = {2.0f, 0.0f, 1.0f,
                                           1.0f, 0.0f, 2.0f};
  std::vector<bst_float> out_preds = {0.0f, 2.0f};
  obj->PredTransform(&io_preds);

  auto& preds = io_preds.HostVector();

  for (int i = 0; i < static_cast<int>(io_preds.Size()); ++i) {
    EXPECT_NEAR(preds[i], out_preds[i], 0.01f);
  }
}

void TestSoftprobMultiClassBasic(const Context* ctx) {
  std::vector<std::pair<std::string, std::string>> args {
    std::pair<std::string, std::string>("num_class", "3")};

  std::unique_ptr<ObjFunction> obj {
    ObjFunction::Create("multi:softprob", ctx)
  };
  obj->Configure(args);
  CheckConfigReload(obj, "multi:softprob");

  HostDeviceVector<bst_float>  io_preds = {2.0f, 0.0f, 1.0f};
  std::vector<bst_float> out_preds = {0.66524096f, 0.09003057f, 0.24472847f};

  obj->PredTransform(&io_preds);
  auto& preds = io_preds.HostVector();

  for (int i = 0; i < static_cast<int>(io_preds.Size()); ++i) {
    EXPECT_NEAR(preds[i], out_preds[i], 0.01f);
  }
}

}  // namespace xgboost