IncrementPolicy is used as a helper class for DatasetMapper. More...

Public Types
using	MappedType = size_t

Public Member Functions
template<typename MapType >
MappedType	MapString (const std::string &string, const size_t dimension, MapType &maps, std::vector< Datatype > &types)
	Given the string and the dimension to which the it belongs, and the maps and types given by the DatasetMapper class, returns its numeric mapping. More...

template<typename eT , typename MapType >
void	MapTokens (const std::vector< std::string > &tokens, size_t &row, arma::Mat< eT > &matrix, MapType &maps, std::vector< Datatype > &types)
	MapTokens turns vector of strings into numeric variables and puts them into a given matrix. More...

Detailed Description

IncrementPolicy is used as a helper class for DatasetMapper.

It tells how the strings should be mapped. Purpose of this policy is to map all dimension if one if the variables in a dimension turns out to be a categorical variable. IncrementPolicy maps strings to incrementing unsigned integers (size_t). The first string to be mapped will be mapped to 0, the next to 1 and so on.

Definition at line 29 of file increment_policy.hpp.

Member Typedef Documentation

using mlpack::data::IncrementPolicy::MappedType = size_t

Definition at line 33 of file increment_policy.hpp.

Member Function Documentation

template<typename MapType >

MappedType mlpack::data::IncrementPolicy::MapString	(	const std::string &	string,
		const size_t	dimension,
		MapType &	maps,
		std::vector< Datatype > &	types
	)

inline

Given the string and the dimension to which the it belongs, and the maps and types given by the DatasetMapper class, returns its numeric mapping.

If no mapping yet exists, the string is added to the list of mappings for the given dimension. This function is used as a helper function for DatasetMapper class.

Template Parameters

MapType Type of unordered_map that contains mapped value pairs

Parameters

string	String to find/create mapping for.
dimension	Index of the dimension of the string.
maps	Unordered map given by the DatasetMapper.
types	Vector containing the type information about each dimensions.

Definition at line 49 of file increment_policy.hpp.

References mlpack::data::categorical.

Referenced by MapTokens().

template<typename eT , typename MapType >

void mlpack::data::IncrementPolicy::MapTokens	(	const std::vector< std::string > &	tokens,
		size_t &	row,
		arma::Mat< eT > &	matrix,
		MapType &	maps,
		std::vector< Datatype > &	types
	)

inline

MapTokens turns vector of strings into numeric variables and puts them into a given matrix.

It is used as a helper function when trying to load files. Each dimension's tokens are given in to this function. If one of the tokens turns out to be a string, all the tokens should be mapped using the MapString() funciton.

Template Parameters

eT	Type of armadillo matrix.
MapType	Type of unordered_map that contains mapped value pairs.

Parameters

tokens	Vector of variables inside a dimension.
row	Position of the given tokens.
matrix	Matrix to save the data into.
maps	Maps given by the DatasetMapper class.
types	Types of each dimensions given by the DatasetMapper class.

Definition at line 94 of file increment_policy.hpp.

References MapString(), and string().

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

src/mlpack/core/data/map_policies/increment_policy.hpp

Public Types

Public Member Functions

Detailed Description

Member Typedef Documentation

Member Function Documentation