124 lines
4.7 KiB
C++
124 lines
4.7 KiB
C++
#ifndef XGBOOST_FMAP_H
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#define XGBOOST_FMAP_H
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/*!
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* \file xgboost_fmap.h
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* \brief helper class that holds the feature names and interpretations
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* \author Tianqi Chen: tianqi.tchen@gmail.com
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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 "xgboost_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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public:
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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[256], ftype[256];
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while (fscanf(fi, "%d\t%[^\t]\t%s\n", &fid, fname, ftype) == 3){
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utils::Assert(fid == (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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}
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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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private:
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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 utils{
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/*! \brief feature constraint, allow or disallow some feature during training */
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class FeatConstrain{
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public:
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FeatConstrain(void){
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default_state_ = +1;
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}
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/*!\brief set parameters */
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inline void SetParam(const char *name, const char *val){
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int a, b;
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if (!strcmp(name, "fban")){
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this->ParseRange(val, a, b);
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this->SetRange(a, b, -1);
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}
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if (!strcmp(name, "fpass")){
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this->ParseRange(val, a, b);
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this->SetRange(a, b, +1);
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}
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if (!strcmp(name, "fdefault")){
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default_state_ = atoi(val);
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}
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}
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/*! \brief whether constrain is specified */
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inline bool HasConstrain(void) const {
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return state_.size() != 0 && default_state_ == 1;
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}
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/*! \brief whether a feature index is banned or not */
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inline bool NotBanned(unsigned index) const{
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int rt = index < state_.size() ? state_[index] : default_state_;
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if (rt == 0) rt = default_state_;
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return rt == 1;
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}
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private:
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inline void SetRange(int a, int b, int st){
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if (b >(int)state_.size()) state_.resize(b, 0);
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for (int i = a; i < b; ++i){
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state_[i] = st;
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}
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}
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inline void ParseRange(const char *val, int &a, int &b){
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if (sscanf(val, "%d-%d", &a, &b) == 2) return;
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utils::Assert(sscanf(val, "%d", &a) == 1);
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b = a + 1;
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}
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/*! \brief default state */
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int default_state_;
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/*! \brief whether the state here is, +1:pass, -1: ban, 0:default */
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std::vector<int> state_;
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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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