6f16f0ef58
* Fix various typos * Add override to functions that are overridden gcc gives warnings about functions that are being overridden by not being marked as oveirridden. This fixes it. * Use bst_float consistently Use bst_float for all the variables that involve weight, leaf value, gradient, hessian, gain, loss_chg, predictions, base_margin, feature values. In some cases, when due to additions and so on the value can take a larger value, double is used. This ensures that type conversions are minimal and reduces loss of precision.
77 lines
2.3 KiB
C++
77 lines
2.3 KiB
C++
/*!
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* Copyright 2014 by Contributors
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* \file metric.h
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* \brief interface of evaluation metric function supported in xgboost.
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* \author Tianqi Chen, Kailong Chen
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*/
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#ifndef XGBOOST_METRIC_H_
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#define XGBOOST_METRIC_H_
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#include <dmlc/registry.h>
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#include <vector>
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#include <string>
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#include <functional>
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#include "./data.h"
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#include "./base.h"
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namespace xgboost {
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/*!
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* \brief interface of evaluation metric used to evaluate model performance.
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* This has nothing to do with training, but merely act as evaluation purpose.
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*/
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class Metric {
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public:
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/*!
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* \brief evaluate a specific metric
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* \param preds prediction
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* \param info information, including label etc.
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* \param distributed whether a call to Allreduce is needed to gather
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* the average statistics across all the node,
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* this is only supported by some metrics
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*/
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virtual bst_float Eval(const std::vector<bst_float>& preds,
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const MetaInfo& info,
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bool distributed) const = 0;
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/*! \return name of metric */
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virtual const char* Name() const = 0;
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/*! \brief virtual destructor */
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virtual ~Metric() {}
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/*!
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* \brief create a metric according to name.
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* \param name name of the metric.
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* name can be in form metric[@]param
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* and the name will be matched in the registry.
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* \return the created metric.
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*/
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static Metric* Create(const std::string& name);
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};
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/*!
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* \brief Registry entry for Metric factory functions.
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* The additional parameter const char* param gives the value after @, can be null.
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* For example, metric map@3, then: param == "3".
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*/
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struct MetricReg
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: public dmlc::FunctionRegEntryBase<MetricReg,
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std::function<Metric* (const char*)> > {
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};
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/*!
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* \brief Macro to register metric.
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*
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* \code
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* // example of registering a objective ndcg@k
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* XGBOOST_REGISTER_METRIC(RMSE, "ndcg")
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* .describe("Rooted mean square error.")
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* .set_body([](const char* param) {
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* int at_k = atoi(param);
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* return new NDCG(at_k);
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* });
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* \endcode
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*/
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#define XGBOOST_REGISTER_METRIC(UniqueId, Name) \
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::xgboost::MetricReg& __make_ ## MetricReg ## _ ## UniqueId ## __ = \
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::dmlc::Registry< ::xgboost::MetricReg>::Get()->__REGISTER__(Name)
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} // namespace xgboost
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#endif // XGBOOST_METRIC_H_
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