PLearn::DilogarithmVariable Class Reference

This is the primitive of a sigmoid: log(1+exp(x)). More...

#include <DilogarithmVariable.h>

Inheritance diagram for PLearn::DilogarithmVariable:

[legend]Collaboration diagram for PLearn::DilogarithmVariable:

[legend]List of all members.

Public Member Functions
	DilogarithmVariable ()
	Default constructor for persistence.
	DilogarithmVariable (Variable *input)
	PLEARN_DECLARE_OBJECT (DilogarithmVariable)
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
Private Types
typedef UnaryVariable	inherited

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Detailed Description

This is the primitive of a sigmoid: log(1+exp(x)).

Definition at line 55 of file DilogarithmVariable.h.

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Member Typedef Documentation

typedef UnaryVariable PLearn::DilogarithmVariable::inherited [private]

Reimplemented from PLearn::UnaryVariable. Definition at line 57 of file DilogarithmVariable.h. Referenced by DilogarithmVariable().

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Constructor & Destructor Documentation

PLearn::DilogarithmVariable::DilogarithmVariable (   )  [inline]

Default constructor for persistence. Definition at line 61 of file DilogarithmVariable.h.

PLearn::DilogarithmVariable::DilogarithmVariable (  Variable *  input  )

Definition at line 58 of file DilogarithmVariable.cc. References inherited.

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Member Function Documentation

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

Implements PLearn::Variable. Definition at line 85 of file DilogarithmVariable.cc. References PLearn::Variable::nelems().

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

compute output given input Implements PLearn::Variable. Definition at line 72 of file DilogarithmVariable.cc. References PLearn::dilogarithm(), PLearn::is_missing(), PLearn::Variable::nelems(), and PLWARNING.

PLearn::DilogarithmVariable::PLEARN_DECLARE_OBJECT (  DilogarithmVariable   )

void PLearn::DilogarithmVariable::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 63 of file DilogarithmVariable.cc. References PLearn::Var::length(), and PLearn::Var::width().

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

compute a piece of new Var graph that represents the symbolic derivative of this Var Reimplemented from PLearn::Variable. Definition at line 96 of file DilogarithmVariable.cc. References PLERROR.

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

• DilogarithmVariable.h
• DilogarithmVariable.cc

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