PLearn::MinusScalarVariable Class Reference

#include <MinusScalarVariable.h>

Inheritance diagram for PLearn::MinusScalarVariable:

[legend]Collaboration diagram for PLearn::MinusScalarVariable:

[legend]List of all members.

Public Member Functions
	MinusScalarVariable ()
	Default constructor for persistence.
	MinusScalarVariable (Variable *input1, Variable *input2)
	PLEARN_DECLARE_OBJECT (MinusScalarVariable)
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 ()
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 ()
Protected Member Functions
void	build_ ()
Private Types
typedef BinaryVariable	inherited

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Detailed Description

* Minus... *

Definition at line 54 of file MinusScalarVariable.h.

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Member Typedef Documentation

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

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

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Constructor & Destructor Documentation

PLearn::MinusScalarVariable::MinusScalarVariable (   )  [inline]

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

PLearn::MinusScalarVariable::MinusScalarVariable (  Variable *  input1, Variable *  input2 )

Definition at line 58 of file MinusScalarVariable.cc. References build_(), and inherited.

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Member Function Documentation

void PLearn::MinusScalarVariable::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 105 of file MinusScalarVariable.cc. References k, PLearn::Var::length(), and PLearn::Variable::nelems().

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

Implements PLearn::Variable. Definition at line 95 of file MinusScalarVariable.cc. References k, and PLearn::Variable::nelems().

void PLearn::MinusScalarVariable::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 65 of file MinusScalarVariable.cc. References build_().

void PLearn::MinusScalarVariable::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 72 of file MinusScalarVariable.cc. References PLERROR. Referenced by build(), and MinusScalarVariable().

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

compute output given input Implements PLearn::Variable. Definition at line 87 of file MinusScalarVariable.cc. References k, and PLearn::Variable::nelems().

PLearn::MinusScalarVariable::PLEARN_DECLARE_OBJECT (  MinusScalarVariable   )

void PLearn::MinusScalarVariable::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 78 of file MinusScalarVariable.cc. References PLearn::Var::length(), and PLearn::Var::width().

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

Reimplemented from PLearn::Variable. Definition at line 127 of file MinusScalarVariable.cc. References k, PLearn::TVec< T >::length(), PLearn::Variable::nelems(), and PLearn::BinaryVariable::resizeRValue().

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

compute a piece of new Var graph that represents the symbolic derivative of this Var Reimplemented from PLearn::Variable. Definition at line 119 of file MinusScalarVariable.cc. References PLearn::sum().

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

• MinusScalarVariable.h
• MinusScalarVariable.cc

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