PLearn 0.1
Public Member Functions | Static Public Member Functions | Static Public Attributes | Private Types | Private Member Functions
PLearn::LogSoftmaxVariable Class Reference

#include <LogSoftmaxVariable.h>

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List of all members.

Public Member Functions

 LogSoftmaxVariable ()
 Default constructor.
 LogSoftmaxVariable (Variable *input, bool call_build_=true)
 Convenience constructor.
virtual string classname () const
virtual OptionListgetOptionList () const
virtual OptionMapgetOptionMap () const
virtual RemoteMethodMapgetRemoteMethodMap () const
virtual LogSoftmaxVariabledeepCopy (CopiesMap &copies) const
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 ()
 Nothing to do by default.
virtual void bprop ()
 Nothing to do by default.
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 build ()
 Post-constructor.

Static Public Member Functions

static string _classname_ ()
 LogSoftmaxVariable.
static OptionList_getOptionList_ ()
static RemoteMethodMap_getRemoteMethodMap_ ()
static Object_new_instance_for_typemap_ ()
static bool _isa_ (const Object *o)
static void _static_initialize_ ()
static const PPathdeclaringFile ()

Static Public Attributes

static StaticInitializer _static_initializer_

Private Types

typedef UnaryVariable inherited

Private Member Functions

void build_ ()
 Object-specific post-constructor.

Detailed Description

Definition at line 52 of file LogSoftmaxVariable.h.


Member Typedef Documentation

Reimplemented from PLearn::UnaryVariable.

Definition at line 54 of file LogSoftmaxVariable.h.


Constructor & Destructor Documentation

PLearn::LogSoftmaxVariable::LogSoftmaxVariable ( ) [inline]

Default constructor.

Definition at line 59 of file LogSoftmaxVariable.h.

{};
PLearn::LogSoftmaxVariable::LogSoftmaxVariable ( Variable input,
bool  call_build_ = true 
)

Convenience constructor.

Definition at line 60 of file LogSoftmaxVariable.cc.

References build_().

                                                                       :
    inherited(input, input->length(), input->width(), call_build_)
{
    if (call_build_)
        build_();
}

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Member Function Documentation

string PLearn::LogSoftmaxVariable::_classname_ ( ) [static]

LogSoftmaxVariable.

Reimplemented from PLearn::UnaryVariable.

Definition at line 55 of file LogSoftmaxVariable.cc.

OptionList & PLearn::LogSoftmaxVariable::_getOptionList_ ( ) [static]

Reimplemented from PLearn::UnaryVariable.

Definition at line 55 of file LogSoftmaxVariable.cc.

RemoteMethodMap & PLearn::LogSoftmaxVariable::_getRemoteMethodMap_ ( ) [static]

Reimplemented from PLearn::UnaryVariable.

Definition at line 55 of file LogSoftmaxVariable.cc.

bool PLearn::LogSoftmaxVariable::_isa_ ( const Object o) [static]

Reimplemented from PLearn::UnaryVariable.

Definition at line 55 of file LogSoftmaxVariable.cc.

Object * PLearn::LogSoftmaxVariable::_new_instance_for_typemap_ ( ) [static]

Reimplemented from PLearn::UnaryVariable.

Definition at line 55 of file LogSoftmaxVariable.cc.

StaticInitializer LogSoftmaxVariable::_static_initializer_ & PLearn::LogSoftmaxVariable::_static_initialize_ ( ) [static]

Reimplemented from PLearn::UnaryVariable.

Definition at line 55 of file LogSoftmaxVariable.cc.

void PLearn::LogSoftmaxVariable::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 113 of file LogSoftmaxVariable.cc.

References PLERROR.

{
    PLERROR("LogSofmaxVariable::bbprop() not implemented");
}
void PLearn::LogSoftmaxVariable::bprop ( ) [virtual]

Nothing to do by default.

Reimplemented from PLearn::UnaryVariable.

Definition at line 101 of file LogSoftmaxVariable.cc.

References PLearn::Variable::gradientdata, i, PLearn::UnaryVariable::input, PLearn::Variable::nelems(), PLearn::safeexp(), PLearn::sum(), and PLearn::Variable::valuedata.

{
    for (int i = 0; i < input->nelems(); ++i) {
        real sum = 0.;
        for (int k = 0; k < nelems(); ++k)
            sum += gradientdata[k];
        input->gradientdata[i] += gradientdata[i] - sum * safeexp(valuedata[i]);
    }
}

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void PLearn::LogSoftmaxVariable::build ( ) [virtual]

Post-constructor.

The normal implementation 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::UnaryVariable.

Definition at line 70 of file LogSoftmaxVariable.cc.

References PLearn::UnaryVariable::build(), and build_().

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void PLearn::LogSoftmaxVariable::build_ ( ) [private]

Object-specific post-constructor.

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 its parent's build_() has already been called.

Reimplemented from PLearn::UnaryVariable.

Definition at line 79 of file LogSoftmaxVariable.cc.

Referenced by build(), and LogSoftmaxVariable().

{
    // Nothing to do here.
}

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string PLearn::LogSoftmaxVariable::classname ( ) const [virtual]

Reimplemented from PLearn::UnaryVariable.

Definition at line 55 of file LogSoftmaxVariable.cc.

static const PPath& PLearn::LogSoftmaxVariable::declaringFile ( ) [inline, static]

Reimplemented from PLearn::UnaryVariable.

Definition at line 64 of file LogSoftmaxVariable.h.

:

LogSoftmaxVariable * PLearn::LogSoftmaxVariable::deepCopy ( CopiesMap copies) const [virtual]

Reimplemented from PLearn::UnaryVariable.

Definition at line 55 of file LogSoftmaxVariable.cc.

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

Nothing to do by default.

Reimplemented from PLearn::UnaryVariable.

Definition at line 94 of file LogSoftmaxVariable.cc.

References PLearn::UnaryVariable::input, PLearn::log_softmax(), and PLearn::Variable::value.

{
    log_softmax(input->value, value);
}

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OptionList & PLearn::LogSoftmaxVariable::getOptionList ( ) const [virtual]

Reimplemented from PLearn::UnaryVariable.

Definition at line 55 of file LogSoftmaxVariable.cc.

OptionMap & PLearn::LogSoftmaxVariable::getOptionMap ( ) const [virtual]

Reimplemented from PLearn::UnaryVariable.

Definition at line 55 of file LogSoftmaxVariable.cc.

RemoteMethodMap & PLearn::LogSoftmaxVariable::getRemoteMethodMap ( ) const [virtual]

Reimplemented from PLearn::UnaryVariable.

Definition at line 55 of file LogSoftmaxVariable.cc.

void PLearn::LogSoftmaxVariable::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 84 of file LogSoftmaxVariable.cc.

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

{
    if (input) {
        l = input->length();
        w = input->width();
    } else
        l = w = 0;
}

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

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

Reimplemented from PLearn::Variable.

Definition at line 120 of file LogSoftmaxVariable.cc.

References PLERROR.

{
    PLERROR("LogSofmaxVariable::symbolicBprop() not implemented");
}

Member Data Documentation

Reimplemented from PLearn::UnaryVariable.

Definition at line 64 of file LogSoftmaxVariable.h.


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