PLearn::IfThenElseVariable Class Reference

#include <IfThenElseVariable.h>

Inheritance diagram for PLearn::IfThenElseVariable:

[legend]Collaboration diagram for PLearn::IfThenElseVariable:

[legend]List of all members.

Public Member Functions
	IfThenElseVariable ()
	Default constructor for persistence.
	IfThenElseVariable (Var IfVar, Var ThenVar, Var ElseVar)
	PLEARN_DECLARE_OBJECT (IfThenElseVariable)
virtual void	build ()
	Should call simply inherited::build(), then this class's build_().
virtual void	recomputeSize (int &l, int &w) const
	Recomputes the length l and width w that this variable should have, according to its parent variables.
virtual void	fprop ()
	compute output given input
virtual void	bprop ()
virtual void	symbolicBprop ()
	compute a piece of new Var graph that represents the symbolic derivative of this Var
virtual void	rfprop ()
Var &	If ()
Var &	Then ()
Var &	Else ()
Protected Member Functions
void	build_ ()
Private Types
typedef NaryVariable	inherited

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Detailed Description

Variable that represents the element-wise IF-THEN-ELSE: the first parent is the test (0 or different from 0), the second parent is the value returned when the test is !=0, the third parent is the value returned when the test is ==0,

Definition at line 57 of file IfThenElseVariable.h.

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Member Typedef Documentation

typedef NaryVariable PLearn::IfThenElseVariable::inherited [private]

Reimplemented from PLearn::NaryVariable. Definition at line 59 of file IfThenElseVariable.h. Referenced by IfThenElseVariable().

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Constructor & Destructor Documentation

PLearn::IfThenElseVariable::IfThenElseVariable (   )  [inline]

Default constructor for persistence. Definition at line 63 of file IfThenElseVariable.h.

PLearn::IfThenElseVariable::IfThenElseVariable (  Var  IfVar, Var  ThenVar, Var  ElseVar )

Definition at line 56 of file IfThenElseVariable.cc. References build_(), and inherited.

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Member Function Documentation

void PLearn::IfThenElseVariable::bprop (   )  [virtual]

Implements PLearn::Variable. Definition at line 119 of file IfThenElseVariable.cc. References Else(), If(), k, PLearn::Variable::nelems(), and Then().

void PLearn::IfThenElseVariable::build (   )  [virtual]

Should call simply inherited::build(), then this class's build_(). This method should be callable again at later times, after modifying some option fields to change the "architecture" of the object. Reimplemented from PLearn::Variable. Definition at line 63 of file IfThenElseVariable.cc. References build_().

void PLearn::IfThenElseVariable::build_ (   )  [protected]

This method should be redefined in subclasses and do the actual building of the object according to previously set option fields. Constructors can just set option fields, and then call build_. This method is NOT virtual, and will typically be called only from three places: a constructor, the public virtual build() method, and possibly the public virtual read method (which calls its parent's read). build_() can assume that it's parent's build_ has already been called. Reimplemented from PLearn::Variable. Definition at line 70 of file IfThenElseVariable.cc. References PLearn::TVec< Var >::length(), PLERROR, and PLearn::TVec< Var >::size(). Referenced by build(), and IfThenElseVariable().

Var& PLearn::IfThenElseVariable::Else (   )  [inline]

Definition at line 77 of file IfThenElseVariable.h. Referenced by bprop(), fprop(), rfprop(), and symbolicBprop().

void PLearn::IfThenElseVariable::fprop (   )  [virtual]

compute output given input Implements PLearn::Variable. Definition at line 89 of file IfThenElseVariable.cc. References Else(), If(), k, PLearn::Variable::nelems(), and Then().

Var& PLearn::IfThenElseVariable::If (   )  [inline]

Definition at line 75 of file IfThenElseVariable.h. Referenced by bprop(), fprop(), rfprop(), and symbolicBprop().

PLearn::IfThenElseVariable::PLEARN_DECLARE_OBJECT (  IfThenElseVariable   )

void PLearn::IfThenElseVariable::recomputeSize (  int &  l, int &  w )  const [virtual]

Recomputes the length l and width w that this variable should have, according to its parent variables. This is used for ex. by sizeprop() The default version stupidly returns the current dimensions, so make sure to overload it in subclasses if this is not appropriate. Reimplemented from PLearn::Variable. Definition at line 80 of file IfThenElseVariable.cc. References PLearn::TVec< Var >::length(), and PLearn::TVec< Var >::size().

void PLearn::IfThenElseVariable::rfprop (   )  [virtual]

Reimplemented from PLearn::Variable. Definition at line 157 of file IfThenElseVariable.cc. References Else(), If(), k, PLearn::TVec< T >::length(), PLearn::Variable::nelems(), PLearn::NaryVariable::resizeRValue(), and Then().

void PLearn::IfThenElseVariable::symbolicBprop (   )  [virtual]

compute a piece of new Var graph that represents the symbolic derivative of this Var Reimplemented from PLearn::Variable. Definition at line 149 of file IfThenElseVariable.cc. References Else(), If(), PLearn::ifThenElse(), PLearn::Variable::length(), Then(), and PLearn::Variable::width().

Var& PLearn::IfThenElseVariable::Then (   )  [inline]

Definition at line 76 of file IfThenElseVariable.h. Referenced by bprop(), fprop(), rfprop(), and symbolicBprop().

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

• IfThenElseVariable.h
• IfThenElseVariable.cc

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