Cosan::Encoder< NumericType > Class Template Reference

#include <encoder.h>

Inheritance diagram for Cosan::Encoder< NumericType >:

Public Member Functions
	Encoder ()=delete
	Encoder (CosanRawData< NumericType > &RD, bool add_back=false)
void	fit (CosanRawData< NumericType > &RD)
CosanMatrix< NumericType > &	GetCatMatrix ()
std::vector< std::unordered_map< std::string, gsl::index > >	getCategories () const
Public Member Functions inherited from Cosan::Preprocessor< NumericType >
	Preprocessor ()
virtual	~Preprocessor ()=default
virtual void	fit (const CosanMatrix< NumericType > &X)
virtual CosanMatrix< NumericType >	transform (const CosanMatrix< NumericType > &X)
Public Member Functions inherited from Cosan::CosanBO
	CosanBO ()
	Default constructor. More...
virtual const std::string	GetName () const
	Get the name of the objects. More...

Private Attributes
std::vector< std::unordered_map< std::string, gsl::index > >	categories
CosanMatrix< NumericType >	CatMatrix

Detailed Description

template<Numeric NumericType>
class Cosan::Encoder< NumericType >

Definition at line 9 of file encoder.h.

Constructor & Destructor Documentation

Encoder() [1/2]

template<Numeric NumericType>

Cosan::Encoder< NumericType >::Encoder ( )

delete

Encoder() [2/2]

template<Numeric NumericType>

Cosan::Encoder< NumericType >::Encoder ( CosanRawData< NumericType > &  RD, bool  add_back = false  )

inline

Definition at line 25 of file encoder.h.

                                                                     : Preprocessor<NumericType>() {
            fit(RD);
            if (add_back==true){
                RD.ConcatenateData(CatMatrix);
                fmt::print("Notice that CRD.X has been modified. The dimension of X is ({:},{:}). {:} columns of one-hot encodings have been added.\n",RD.GetrowsX(),RD.GetcolsX(),CatMatrix.cols());
            }
        }

Member Function Documentation

fit()

template<Numeric NumericType>

void Cosan::Encoder< NumericType >::fit ( CosanRawData< NumericType > &  RD )

inline

Definition at line 32 of file encoder.h.

                                                 {
            fmt::print("*********************************\n");
            fmt::print("Begin encoding categorical data !\n");
 
            gsl::index colCat = RD.GetcolCatX().size();
            std::vector <std::string> svaluesX = RD.GetsvaluesX();
            gsl::index totalCol = 0;
            std::vector<std::vector<std::string>> svalues;
            svalues = std::vector < std::vector <
                      std::string >> (colCat, std::vector<std::string>(svaluesX.size() / colCat, ""));
            CosanMatrix <NumericType> OneHotMatrixi;
            for (gsl::index col = 0; col < colCat; col++) {
                std::unordered_map <std::string, gsl::index> categoryToOrdinal{};
                for (gsl::index row = 0; row < svaluesX.size() / colCat; row++) {
                    svalues[col][row] = svaluesX[row * colCat + col];
                    if (categoryToOrdinal.find(svalues[col][row]) == categoryToOrdinal.end()) {
                        categoryToOrdinal.insert({svalues[col][row], categoryToOrdinal.size()});
                    }
                }
                this->categories.push_back(categoryToOrdinal);
                OneHotMatrixi = CosanMatrix<NumericType>::Zero(svaluesX.size() / colCat, categoryToOrdinal.size());
                for (gsl::index row = 0; row < svaluesX.size() / colCat; row++) {
                    OneHotMatrixi(row, categoryToOrdinal[svalues[col][row]]) = 1;
                }
                if (col == 0) {
                    CatMatrix = OneHotMatrixi;
                } else {
                    for (gsl::index i = 0; i < OneHotMatrixi.cols(); i++) {
                        CatMatrix.conservativeResize(CatMatrix.rows(), CatMatrix.cols() + 1);
                        CatMatrix.col(CatMatrix.cols() - 1) = OneHotMatrixi.col(i);
                    }
                }
 
            }
            fmt::print("Finish encoding categorical data! Get access to the newly-generated additional matrix via .GetCatMatrix()\n");
            fmt::print("*********************************\n");
        }

getCategories()

template<Numeric NumericType>

std::vector<std::unordered_map<std::string, gsl::index> > Cosan::Encoder< NumericType >::getCategories ( ) const

inline

Definition at line 71 of file encoder.h.

                                                                                {
            return this->categories;}

GetCatMatrix()

template<Numeric NumericType>

CosanMatrix<NumericType>& Cosan::Encoder< NumericType >::GetCatMatrix ( )

inline

Definition at line 70 of file encoder.h.

{return CatMatrix;}

Member Data Documentation

categories

template<Numeric NumericType>

std::vector<std::unordered_map<std::string, gsl::index> > Cosan::Encoder< NumericType >::categories

private

Definition at line 75 of file encoder.h.

CatMatrix

template<Numeric NumericType>

CosanMatrix<NumericType> Cosan::Encoder< NumericType >::CatMatrix

private

Definition at line 76 of file encoder.h.

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The documentation for this class was generated from the following file:

• cosan/preprocessing/encoder.h