PLearn::NegCrossEntropySigmoidVariable Class Reference

#include <NegCrossEntropySigmoidVariable.h>

Inheritance diagram for PLearn::NegCrossEntropySigmoidVariable:

[legend]Collaboration diagram for PLearn::NegCrossEntropySigmoidVariable:

[legend]List of all members.

Public Member Functions
	NegCrossEntropySigmoidVariable ()
	Default constructor for persistence.
	NegCrossEntropySigmoidVariable (Variable *netout, Variable *target, real regularizer_=0.0)
	PLEARN_DECLARE_OBJECT (NegCrossEntropySigmoidVariable)
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 ()
void	setRegularizer (real r)
	Deprecated.
Protected Member Functions
void	build_ ()
Protected Attributes
real	regularizer
	If > 0, will modify the cost function to: (1-t)(r*log(o)+(1-r)*log(1-o)) + t*(r*log(1-o)+(1-r)*log(o)) (t = target, o = output, r = regularizer = a small value).
Private Types
typedef BinaryVariable	inherited

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Member Typedef Documentation

typedef BinaryVariable PLearn::NegCrossEntropySigmoidVariable::inherited [private]

Reimplemented from PLearn::BinaryVariable. Definition at line 54 of file NegCrossEntropySigmoidVariable.h. Referenced by NegCrossEntropySigmoidVariable().

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Constructor & Destructor Documentation

PLearn::NegCrossEntropySigmoidVariable::NegCrossEntropySigmoidVariable (   )  [inline]

Default constructor for persistence. Definition at line 64 of file NegCrossEntropySigmoidVariable.h.

PLearn::NegCrossEntropySigmoidVariable::NegCrossEntropySigmoidVariable (  Variable *  netout, Variable *  target, real  regularizer_ = 0.0 )

Definition at line 59 of file NegCrossEntropySigmoidVariable.cc. References build_(), and inherited.

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Member Function Documentation

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

Implements PLearn::Variable. Definition at line 125 of file NegCrossEntropySigmoidVariable.cc. References PLERROR, regularizer, and PLearn::sigmoid().

void PLearn::NegCrossEntropySigmoidVariable::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 66 of file NegCrossEntropySigmoidVariable.cc. References build_().

void PLearn::NegCrossEntropySigmoidVariable::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 73 of file NegCrossEntropySigmoidVariable.cc. References PLERROR. Referenced by build(), and NegCrossEntropySigmoidVariable().

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

compute output given input Implements PLearn::Variable. Definition at line 91 of file NegCrossEntropySigmoidVariable.cc. References PLearn::log(), PLWARNING, regularizer, and PLearn::sigmoid().

PLearn::NegCrossEntropySigmoidVariable::PLEARN_DECLARE_OBJECT (  NegCrossEntropySigmoidVariable   )

void PLearn::NegCrossEntropySigmoidVariable::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 85 of file NegCrossEntropySigmoidVariable.cc.

void PLearn::NegCrossEntropySigmoidVariable::setRegularizer (  real  r  )

Deprecated. Definition at line 151 of file NegCrossEntropySigmoidVariable.cc. References PLWARNING, and regularizer.

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Member Data Documentation

real PLearn::NegCrossEntropySigmoidVariable::regularizer [protected]

If > 0, will modify the cost function to: (1-t)(r*log(o)+(1-r)*log(1-o)) + t*(r*log(1-o)+(1-r)*log(o)) (t = target, o = output, r = regularizer = a small value). Definition at line 60 of file NegCrossEntropySigmoidVariable.h. Referenced by bprop(), fprop(), and setRegularizer().

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

• NegCrossEntropySigmoidVariable.h
• NegCrossEntropySigmoidVariable.cc

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