mlpack
2.2.5
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IncrementPolicy is used as a helper class for DatasetMapper. More...
Public Types | |
using | MappedType = size_t |
Public Member Functions | |
template<typename T > | |
void | MapFirstPass (const std::string &string, const size_t dim, std::vector< Datatype > &types) |
Determine if the dimension is numeric or categorical. More... | |
template<typename MapType , typename T > | |
T | 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... | |
Static Public Attributes | |
static const bool | NeedsFirstPass = true |
We do need a first pass over the data to set the dimension types right. More... | |
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.
using MappedType = size_t |
Definition at line 33 of file increment_policy.hpp.
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Determine if the dimension is numeric or categorical.
Definition at line 42 of file increment_policy.hpp.
References mlpack::data::categorical.
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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.
MapType | Type of unordered_map that contains mapped value pairs |
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 81 of file increment_policy.hpp.
References mlpack::data::categorical, and mlpack::data::numeric.
Referenced by IncrementPolicy::MapTokens().
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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.
eT | Type of armadillo matrix. |
MapType | Type of unordered_map that contains mapped value pairs. |
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 146 of file increment_policy.hpp.
References IncrementPolicy::MapString().
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static |
We do need a first pass over the data to set the dimension types right.
Definition at line 36 of file increment_policy.hpp.