Function TestPoissonRegressionBasic

tests/cpp/objective/test_regression_obj.cc:168–192

}

void TestPoissonRegressionBasic(const Context* ctx) {
  std::vector<std::pair<std::string, std::string>> args;
  std::unique_ptr<ObjFunction> obj{ObjFunction::Create("count:poisson", ctx)};

  obj->Configure(args);
  CheckConfigReload(obj, "count:poisson");

  // test label validation
  EXPECT_ANY_THROW(CheckObjFunction(obj, {0}, {-1}, {1}, {0}, {0}))
      << "Expected error when label < 0 for PoissonRegression";

  // test ProbToMargin
  CheckProbaToMargin(obj, 0.1f, -2.30f);
  CheckProbaToMargin(obj, 0.5f, -0.69f);
  CheckProbaToMargin(obj, 0.9f, -0.10f);

  // test PredTransform
  HostDeviceVector<bst_float> io_preds = {0, 0.1f, 0.5f, 0.9f, 1};
  std::vector<bst_float> out_preds = {1, 1.10f, 1.64f, 2.45f, 2.71f};
  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 TestGammaRegressionGPair(const Context* ctx) {
  std::vector<std::pair<std::string, std::string>> args;