gum::learning::DBRowGenerator4CompleteRows Class Reference

A DBRowGenerator class that returns the rows that are complete (fully observed) w.r.t. More...

#include <agrum/base/database/DBRowGenerator4CompleteRows.h>

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Public Member Functions
Constructors / Destructors
	DBRowGenerator4CompleteRows (const std::vector< DBTranslatedValueType > &column_types)
	default constructor
	DBRowGenerator4CompleteRows (const DBRowGenerator4CompleteRows &from)
	copy constructor
	DBRowGenerator4CompleteRows (DBRowGenerator4CompleteRows &&from)
	move constructor
DBRowGenerator4CompleteRows *	clone () const final
	virtual copy constructor
	~DBRowGenerator4CompleteRows ()
	destructor
Operators
DBRowGenerator4CompleteRows &	operator= (const DBRowGenerator4CompleteRows &from)
	copy operator
DBRowGenerator4CompleteRows &	operator= (DBRowGenerator4CompleteRows &&from)
	move operator
Accessors / Modifiers
const DBRow< DBTranslatedValue > &	generate () final
	generates one output DBRow for each DBRow passed to method setInputRow
Accessors / Modifiers
bool	hasRows ()
	returns true if there are still rows that can be output by the DBRowGenerator
bool	setInputRow (const DBRow< DBTranslatedValue > &row)
	sets the input row from which the generator will create its output rows
void	decreaseRemainingRows ()
	decrease the number of remaining output rows
virtual void	reset ()
	resets the generator. There are therefore no more ouput row to generate
virtual void	setColumnsOfInterest (const std::vector< std::size_t > &cols_of_interest)
	sets the columns of interest: the output DBRow needs only contain correct values fot these columns
virtual void	setColumnsOfInterest (std::vector< std::size_t > &&cols_of_interest)
	sets the columns of interest: the output DBRow needs only contain correct values fot these columns
const std::vector< std::size_t > &	columnsOfInterest () const
	returns the current set of columns of interest
DBRowGeneratorGoal	goal () const
	returns the goal of the DBRowGenerator

Protected Member Functions
std::size_t	computeRows_ (const DBRow< DBTranslatedValue > &row) final
	computes the rows it will provide as output

Protected Attributes
std::size_t	nb_remaining_output_rows_ {std::size_t(0)}
	the number of output rows still to retrieve through the generate method
std::vector< DBTranslatedValueType >	column_types_
	the types of the columns in the DatabaseTable
std::vector< std::size_t >	columns_of_interest_
	the set of columns of interest
DBRowGeneratorGoal	goal_ {DBRowGeneratorGoal::OTHER_THINGS_THAN_REMOVE_MISSING_VALUES}
	the goal of the DBRowGenerator (just remove missing values or not)

Detailed Description

A DBRowGenerator class that returns the rows that are complete (fully observed) w.r.t.

the nodes of interest

This class is a DBRowGenerator that returns all the rows that are complete (i.e., fully observed) w.r.t. the nodes of interest. In other words, whenever the values of the nodes of interest are observed in a row, this one is returned, but if at least one node is unobserved, the generator does not return anything. This class is useful for bootstraping EM algorithms.

The standard usage of a DBRowGenerator is the following:

// create a DatabaseTable and fill it
gum::learning::DBTranslatorSet set;
for ( int i = 0; i < 10; ++i )
  set.insertTranslator(gum::learning::DBTranslator4LabelizedVariable(),i);
gum::learning::DatabaseTable database ( set );
// fill the database
 
// keep in a vector the types of the columns in the database
const std::vector<gum::learning::DBTranslatedValueType>
  column_types ( 10, gum::learning::DBTranslatedValueType::DISCRETE );
 
// create the generator
gum::learning::DBRowGenerator4CompleteRows generator ( col_types );
 
// parse the database and produce output rows
for ( auto dbrow : database ) {
  generator.setInputRow ( dbrow );
  if ( generator.hasRows() ) {
    const auto& output_dbrow = generator.generate ();
    // do something with the output dbrow
  }
}

Definition at line 99 of file DBRowGenerator4CompleteRows.h.

Constructor & Destructor Documentation

DBRowGenerator4CompleteRows() [1/3]

gum::learning::DBRowGenerator4CompleteRows::DBRowGenerator4CompleteRows

(

const std::vector< DBTranslatedValueType > &

column_types

)

default constructor

Referenced by DBRowGenerator4CompleteRows(), DBRowGenerator4CompleteRows(), ~DBRowGenerator4CompleteRows(), clone(), operator=(), and operator=().

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DBRowGenerator4CompleteRows() [2/3]

gum::learning::DBRowGenerator4CompleteRows::DBRowGenerator4CompleteRows

(

const DBRowGenerator4CompleteRows &

from

)

copy constructor

References DBRowGenerator4CompleteRows().

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DBRowGenerator4CompleteRows() [3/3]

gum::learning::DBRowGenerator4CompleteRows::DBRowGenerator4CompleteRows

(

DBRowGenerator4CompleteRows &&

from

)

move constructor

References DBRowGenerator4CompleteRows().

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~DBRowGenerator4CompleteRows()

gum::learning::DBRowGenerator4CompleteRows::~DBRowGenerator4CompleteRows

(

)

destructor

References DBRowGenerator4CompleteRows().

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Member Function Documentation

clone()

DBRowGenerator4CompleteRows * gum::learning::DBRowGenerator4CompleteRows::clone ( ) const

finalvirtual

virtual copy constructor

Implements gum::learning::DBRowGenerator.

References DBRowGenerator4CompleteRows().

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columnsOfInterest()

const std::vector< std::size_t > & gum::learning::DBRowGenerator::columnsOfInterest ( ) const

inherited

returns the current set of columns of interest

computeRows_()

std::size_t gum::learning::DBRowGenerator4CompleteRows::computeRows_ ( const DBRow< DBTranslatedValue > & row )

finalprotectedvirtual

computes the rows it will provide as output

Implements gum::learning::DBRowGenerator.

References computeRows_().

Referenced by computeRows_().

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decreaseRemainingRows()

void gum::learning::DBRowGenerator::decreaseRemainingRows ( )

inherited

decrease the number of remaining output rows

When method setInputRow is performed, the DBRowGenerator knows how many output rows it will be able to generate. Each time method decreaseRemainingRows is called, we decrement this number. When the number becomes equal to 0, then there remains no new output row to generate.

generate()

const DBRow< DBTranslatedValue > & gum::learning::DBRowGenerator4CompleteRows::generate ( )

finalvirtual

generates one output DBRow for each DBRow passed to method setInputRow

Warning

if this method is applied while the row it should return is incomplete w.r.t. the nodes of interest, its behavior is uncertain and will certainly result in a segmentation fault

Implements gum::learning::DBRowGenerator.

References generate().

Referenced by generate().

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goal()

DBRowGeneratorGoal gum::learning::DBRowGenerator::goal ( ) const

inherited

returns the goal of the DBRowGenerator

Referenced by DBRowGenerator(), and gum::learning::DBRowGeneratorWithBN< GUM_SCALAR >::DBRowGeneratorWithBN().

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hasRows()

bool gum::learning::DBRowGenerator::hasRows ( )

inherited

returns true if there are still rows that can be output by the DBRowGenerator

operator=() [1/2]

DBRowGenerator4CompleteRows & gum::learning::DBRowGenerator4CompleteRows::operator=

(

const DBRowGenerator4CompleteRows &

from

)

copy operator

References DBRowGenerator4CompleteRows().

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operator=() [2/2]

DBRowGenerator4CompleteRows & gum::learning::DBRowGenerator4CompleteRows::operator=

(

DBRowGenerator4CompleteRows &&

from

)

move operator

References DBRowGenerator4CompleteRows().

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reset()

virtual void gum::learning::DBRowGenerator::reset ( )

virtualinherited

resets the generator. There are therefore no more ouput row to generate

setColumnsOfInterest() [1/2]

virtual void gum::learning::DBRowGenerator::setColumnsOfInterest ( const std::vector< std::size_t > & cols_of_interest )

virtualinherited

sets the columns of interest: the output DBRow needs only contain correct values fot these columns

This method is useful, e.g., for EM-like algorithms that need to know which unobserved variables/values need be filled. In this case, the DBRowGenerator still outputs DBRows with the same columns as the DatabaseTable, but only the columns of these DBRows corresponding to those passed in argument to Method setColumnsOfInterest are meaningful. For instance, if a DatabaseTable contains 10 columns and Method setColumnsOfInterest() is applied with vector<> { 0, 3, 4 }, then the DBRowGenerator will output DBRows with 10 columns, in which only columns 0, 3 and 4 are guaranteed to have correct values (columns are always indexed, starting from 0).

setColumnsOfInterest() [2/2]

virtual void gum::learning::DBRowGenerator::setColumnsOfInterest ( std::vector< std::size_t > && cols_of_interest )

virtualinherited

sets the columns of interest: the output DBRow needs only contain correct values fot these columns

This method is useful, e.g., for EM-like algorithms that need to know which unobserved variables/values need be filled. In this case, the DBRowGenerator still outputs DBRows with the same columns as the DatabaseTable, but only the columns of these DBRows corresponding to those passed in argument to Method setColumnsOfInterest are meaningful. For instance, if a DatabaseTable contains 10 columns and Method setColumnsOfInterest() is applied with vector<> { 0, 3, 4 }, then the DBRowGenerator will output DBRows with 10 columns, in which only columns 0, 3 and 4 are guaranteed to have correct values (columns are always indexed, starting from 0).

setInputRow()

bool gum::learning::DBRowGenerator::setInputRow ( const DBRow< DBTranslatedValue > & row )

inherited

sets the input row from which the generator will create its output rows

Returns

a Boolean indicating whether, from this input DBRow, the DBRowGenerator is capable of outputing at least one row or not

Member Data Documentation

column_types_

std::vector< DBTranslatedValueType > gum::learning::DBRowGenerator::column_types_

protectedinherited

the types of the columns in the DatabaseTable

This is useful to determine whether we need to use the .discr_val field or the .cont_val field in DBTranslatedValue instances.

Definition at line 330 of file DBRowGenerator.h.

columns_of_interest_

std::vector< std::size_t > gum::learning::DBRowGenerator::columns_of_interest_

protectedinherited

the set of columns of interest

Definition at line 333 of file DBRowGenerator.h.

goal_

DBRowGeneratorGoal gum::learning::DBRowGenerator::goal_ {DBRowGeneratorGoal::OTHER_THINGS_THAN_REMOVE_MISSING_VALUES}

protectedinherited

the goal of the DBRowGenerator (just remove missing values or not)

Definition at line 336 of file DBRowGenerator.h.

{DBRowGeneratorGoal::OTHER_THINGS_THAN_REMOVE_MISSING_VALUES};

nb_remaining_output_rows_

std::size_t gum::learning::DBRowGenerator::nb_remaining_output_rows_ {std::size_t(0)}

protectedinherited

the number of output rows still to retrieve through the generate method

Definition at line 325 of file DBRowGenerator.h.

{std::size_t(0)};

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

• agrum/base/database/DBRowGenerator4CompleteRows.h