81 lines
2.3 KiB
C++
81 lines
2.3 KiB
C++
#ifndef XGBOOST_UTILS_FMAP_H_
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#define XGBOOST_UTILS_FMAP_H_
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/*!
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* \file fmap.h
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* \brief helper class that holds the feature names and interpretations
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* \author Tianqi Chen
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*/
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#include <vector>
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#include <string>
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#include <cstring>
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#include "./utils.h"
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namespace xgboost {
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namespace utils {
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/*! \brief helper class that holds the feature names and interpretations */
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class FeatMap {
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public:
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enum Type {
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kIndicator = 0,
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kQuantitive = 1,
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kInteger = 2,
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kFloat = 3
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};
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// function definitions
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/*! \brief load feature map from text format */
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inline void LoadText(const char *fname) {
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FILE *fi = utils::FopenCheck(fname, "r");
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this->LoadText(fi);
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fclose(fi);
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}
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/*! \brief load feature map from text format */
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inline void LoadText(FILE *fi) {
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int fid;
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char fname[1256], ftype[1256];
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while (fscanf(fi, "%d\t%[^\t]\t%s\n", &fid, fname, ftype) == 3) {
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this->PushBack(fid, fname, ftype);
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}
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}
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/*!\brief push back feature map */
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inline void PushBack(int fid, const char *fname, const char *ftype) {
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utils::Check(fid == static_cast<int>(names_.size()), "invalid fmap format");
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names_.push_back(std::string(fname));
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types_.push_back(GetType(ftype));
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}
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inline void Clear(void) {
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names_.clear(); types_.clear();
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}
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/*! \brief number of known features */
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size_t size(void) const {
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return names_.size();
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}
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/*! \brief return name of specific feature */
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const char* name(size_t idx) const {
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utils::Assert(idx < names_.size(), "utils::FMap::name feature index exceed bound");
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return names_[idx].c_str();
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}
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/*! \brief return type of specific feature */
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const Type& type(size_t idx) const {
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utils::Assert(idx < names_.size(), "utils::FMap::name feature index exceed bound");
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return types_[idx];
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}
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private:
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inline static Type GetType(const char *tname) {
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if (!strcmp("i", tname)) return kIndicator;
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if (!strcmp("q", tname)) return kQuantitive;
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if (!strcmp("int", tname)) return kInteger;
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if (!strcmp("float", tname)) return kFloat;
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utils::Error("unknown feature type, use i for indicator and q for quantity");
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return kIndicator;
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}
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/*! \brief name of the feature */
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std::vector<std::string> names_;
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/*! \brief type of the feature */
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std::vector<Type> types_;
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};
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} // namespace utils
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} // namespace xgboost
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#endif // XGBOOST_FMAP_H_
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