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PLearn::SoftplusVariable Class Reference

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

#include <SoftplusVariable.h>

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List of all members.

Public Member Functions

 SoftplusVariable ()
 Default constructor for persistence.

 SoftplusVariable (Variable *input)
 PLEARN_DECLARE_OBJECT (SoftplusVariable)
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

Detailed Description

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

Definition at line 53 of file SoftplusVariable.h.


Member Typedef Documentation

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

Reimplemented from PLearn::UnaryVariable.

Definition at line 55 of file SoftplusVariable.h.

Referenced by SoftplusVariable().


Constructor & Destructor Documentation

PLearn::SoftplusVariable::SoftplusVariable  )  [inline]
 

Default constructor for persistence.

Definition at line 59 of file SoftplusVariable.h.

PLearn::SoftplusVariable::SoftplusVariable Variable input  ) 
 

Definition at line 58 of file SoftplusVariable.cc.

References inherited.


Member Function Documentation

void PLearn::SoftplusVariable::bprop  )  [virtual]
 

Implements PLearn::Variable.

Definition at line 78 of file SoftplusVariable.cc.

References PLearn::Variable::nelems(), and PLearn::sigmoid().

void PLearn::SoftplusVariable::fprop  )  [virtual]
 

compute output given input

Implements PLearn::Variable.

Definition at line 71 of file SoftplusVariable.cc.

References PLearn::Variable::nelems(), and PLearn::softplus().

PLearn::SoftplusVariable::PLEARN_DECLARE_OBJECT SoftplusVariable   ) 
 

void PLearn::SoftplusVariable::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 SoftplusVariable.cc.

References PLearn::Var::length(), and PLearn::Var::width().

void PLearn::SoftplusVariable::symbolicBprop  )  [virtual]
 

compute a piece of new Var graph that represents the symbolic derivative of this Var

Reimplemented from PLearn::Variable.

Definition at line 85 of file SoftplusVariable.cc.

References PLearn::sigmoid().


The documentation for this class was generated from the following files:
Generated on Tue Aug 17 16:25:37 2004 for PLearn by doxygen 1.3.7