Contributes to: #5163

• Adds CUDABinaryErrorMetric
• Minor code reorganization:
  • cuda_binary_metric.cpp - Move binary metric constructor definitions after CUDABinaryMetricInterface definition, analogous to how regression metric constructor definitions come after CUDARegressionMetricInterface:
    

    LightGBM/src/metric/cuda/cuda_regression_metric.cpp

    Lines 15 to 48 in 5dbfcdc

    	template <typename HOST_METRIC, typename CUDA_METRIC>
    	std::vector<double> CUDARegressionMetricInterface<HOST_METRIC, CUDA_METRIC>::Eval(const double* score, const ObjectiveFunction* objective) const {
    	const double* score_convert = score;
    	if (objective != nullptr && objective->NeedConvertOutputCUDA()) {
    	this->score_convert_buffer_.Resize(static_cast<size_t>(this->num_data_) * static_cast<size_t>(this->num_class_));
    	score_convert = objective->ConvertOutputCUDA(this->num_data_, score, this->score_convert_buffer_.RawData());
    	}
    	double sum_loss = 0.0, sum_weight = 0.0;
    	this->LaunchEvalKernel(score_convert, &sum_loss, &sum_weight);
    	const double eval_score = this->AverageLoss(sum_loss, sum_weight);
    	return std::vector<double>{eval_score};
    	}
    	CUDARMSEMetric::CUDARMSEMetric(const Config& config): CUDARegressionMetricInterface<RMSEMetric, CUDARMSEMetric>(config) {}
    	CUDAL2Metric::CUDAL2Metric(const Config& config): CUDARegressionMetricInterface<L2Metric, CUDAL2Metric>(config) {}
    	CUDAQuantileMetric::CUDAQuantileMetric(const Config& config): CUDARegressionMetricInterface<QuantileMetric, CUDAQuantileMetric>(config), alpha_(config.alpha) {}
    	CUDAL1Metric::CUDAL1Metric(const Config& config): CUDARegressionMetricInterface<L1Metric, CUDAL1Metric>(config) {}
    	CUDAHuberLossMetric::CUDAHuberLossMetric(const Config& config): CUDARegressionMetricInterface<HuberLossMetric, CUDAHuberLossMetric>(config), alpha_(config.alpha) {}
    	CUDAFairLossMetric::CUDAFairLossMetric(const Config& config): CUDARegressionMetricInterface<FairLossMetric, CUDAFairLossMetric>(config) , fair_c_(config.fair_c) {}
    	CUDAPoissonMetric::CUDAPoissonMetric(const Config& config): CUDARegressionMetricInterface<PoissonMetric, CUDAPoissonMetric>(config) {}
    	CUDAMAPEMetric::CUDAMAPEMetric(const Config& config): CUDARegressionMetricInterface<MAPEMetric, CUDAMAPEMetric>(config) {}
    	CUDAGammaMetric::CUDAGammaMetric(const Config& config): CUDARegressionMetricInterface<GammaMetric, CUDAGammaMetric>(config) {}
    	CUDAGammaDevianceMetric::CUDAGammaDevianceMetric(const Config& config): CUDARegressionMetricInterface<GammaDevianceMetric, CUDAGammaDevianceMetric>(config) {}
    	CUDATweedieMetric::CUDATweedieMetric(const Config& config): CUDARegressionMetricInterface<TweedieMetric, CUDATweedieMetric>(config) , tweedie_variance_power_(config.tweedie_variance_power) {}

  • cuda_pointwise_metric.cu and cuda_pointwise_metric.cpp - Break up regression and binary metric template instantiations