feature_map.h

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#ifndef XGBOOST_FEATURE_MAP_H_
#define XGBOOST_FEATURE_MAP_H_
 
#include <xgboost/logging.h>
 
#include <vector>
#include <string>
#include <cstring>
#include <iostream>
 
namespace xgboost {
class FeatureMap {
 public:
  enum Type {
    kIndicator = 0,
    kQuantitive = 1,
    kInteger = 2,
    kFloat = 3,
    kCategorical = 4
  };
  inline void LoadText(std::istream& is) { // NOLINT(*)
    int fid;
    std::string fname, ftype;
    while (is >> fid >> fname >> ftype) {
      this->PushBack(fid, fname.c_str(), ftype.c_str());
    }
  }
  inline void PushBack(int fid, const char *fname, const char *ftype) {
    CHECK_EQ(fid, static_cast<int>(names_.size()));
    names_.emplace_back(fname);
    types_.push_back(GetType(ftype));
  }
  inline void Clear() {
    names_.clear();
    types_.clear();
  }
  inline size_t Size() const {
    return names_.size();
  }
  inline const char* Name(size_t idx) const {
    CHECK_LT(idx,  names_.size()) << "FeatureMap feature index exceed bound";
    return names_[idx].c_str();
  }
  Type TypeOf(size_t idx) const {
    CHECK_LT(idx, names_.size()) << "FeatureMap feature index exceed bound";
    return types_[idx];
  }
 
 private:
  inline static Type GetType(const char* tname) {
    using std::strcmp;
    if (!strcmp("i", tname)) return kIndicator;
    if (!strcmp("q", tname)) return kQuantitive;
    if (!strcmp("int", tname)) return kInteger;
    if (!strcmp("float", tname)) return kFloat;
    if (!strcmp("c", tname)) return kCategorical;
    LOG(FATAL) << "unknown feature type, use i for indicator and q for quantity";
    return kIndicator;
  }
  std::vector<std::string> names_;
  std::vector<Type> types_;
};
}  // namespace xgboost
#endif  // XGBOOST_FEATURE_MAP_H_