PLearn::NegateElementsVariable Class Reference

#include <NegateElementsVariable.h>

Inheritance diagram for PLearn::NegateElementsVariable:

[legend]Collaboration diagram for PLearn::NegateElementsVariable:

[legend]List of all members.

Public Member Functions
	NegateElementsVariable ()
	Default constructor for persistence.
	NegateElementsVariable (Variable *input)
	PLEARN_DECLARE_OBJECT (NegateElementsVariable)
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	bbprop ()
	compute an approximation to diag(d^2/dinput^2) given diag(d^2/doutput^2), with diag(d^2/dinput^2) ~=~ (doutput/dinput)' diag(d^2/doutput^2) (doutput/dinput) In particular: if 'C' depends on 'y' and 'y' depends on x ...
virtual void	symbolicBprop ()
	compute a piece of new Var graph that represents the symbolic derivative of this Var
virtual void	rfprop ()
Private Types
typedef UnaryVariable	inherited

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Detailed Description

* Elementwise negation and inversion... *

Definition at line 54 of file NegateElementsVariable.h.

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Member Typedef Documentation

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

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

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Constructor & Destructor Documentation

PLearn::NegateElementsVariable::NegateElementsVariable (   )  [inline]

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

PLearn::NegateElementsVariable::NegateElementsVariable (  Variable *  input  )

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

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Member Function Documentation

void PLearn::NegateElementsVariable::bbprop (   )  [virtual]

compute an approximation to diag(d^2/dinput^2) given diag(d^2/doutput^2), with diag(d^2/dinput^2) ~=~ (doutput/dinput)' diag(d^2/doutput^2) (doutput/dinput) In particular: if 'C' depends on 'y' and 'y' depends on x ... d^2C/dx^2 = d^2C/dy^2 * (dy/dx)^2 + dC/dy * d^2y/dx^2 (diaghessian) (gradient) Reimplemented from PLearn::Variable. Definition at line 85 of file NegateElementsVariable.cc. References k, PLearn::Var::length(), and PLearn::Variable::nelems().

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

Implements PLearn::Variable. Definition at line 78 of file NegateElementsVariable.cc. References k, and PLearn::Variable::nelems().

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

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

PLearn::NegateElementsVariable::PLEARN_DECLARE_OBJECT (  NegateElementsVariable   )

void PLearn::NegateElementsVariable::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 NegateElementsVariable.cc. References PLearn::Var::length(), and PLearn::Var::width().

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

Reimplemented from PLearn::Variable. Definition at line 101 of file NegateElementsVariable.cc. References k, PLearn::TVec< T >::length(), PLearn::Variable::nelems(), and PLearn::UnaryVariable::resizeRValue().

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

compute a piece of new Var graph that represents the symbolic derivative of this Var Reimplemented from PLearn::Variable. Definition at line 94 of file NegateElementsVariable.cc.

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

• NegateElementsVariable.h
• NegateElementsVariable.cc

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