PLearn::PLogPVariable Class Reference

returns the elementwise x*log(x) in a (hopefully!) numerically stable way This can be used to compute the Entropy for instance More...

#include <PLogPVariable.h>

Inheritance diagram for PLearn::PLogPVariable:

[legend]Collaboration diagram for PLearn::PLogPVariable:

[legend]List of all members.

Public Member Functions
	PLogPVariable ()
	Default constructor for persistence.
	PLogPVariable (Variable *input)
	PLEARN_DECLARE_OBJECT (PLogPVariable)
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

returns the elementwise x*log(x) in a (hopefully!) numerically stable way This can be used to compute the Entropy for instance

Definition at line 54 of file PLogPVariable.h.

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Member Typedef Documentation

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

Reimplemented from PLearn::UnaryVariable. Definition at line 56 of file PLogPVariable.h. Referenced by PLogPVariable().

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Constructor & Destructor Documentation

PLearn::PLogPVariable::PLogPVariable (   )  [inline]

Default constructor for persistence. Definition at line 60 of file PLogPVariable.h.

PLearn::PLogPVariable::PLogPVariable (  Variable *  input  )

Definition at line 57 of file PLogPVariable.cc. References inherited.

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Member Function Documentation

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

Implements PLearn::Variable. Definition at line 83 of file PLogPVariable.cc. References PLearn::Variable::nelems(), and PLearn::safeflog().

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

compute output given input Implements PLearn::Variable. Definition at line 71 of file PLogPVariable.cc. References PLearn::Variable::nelems(), and PLearn::safeflog().

PLearn::PLogPVariable::PLEARN_DECLARE_OBJECT (  PLogPVariable   )

void PLearn::PLogPVariable::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 62 of file PLogPVariable.cc. References PLearn::Var::length(), and PLearn::Var::width().

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

compute a piece of new Var graph that represents the symbolic derivative of this Var Reimplemented from PLearn::Variable. Definition at line 95 of file PLogPVariable.cc. References PLearn::log().

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

• PLogPVariable.h
• PLogPVariable.cc

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