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TNeuron Class Reference

Definition at line 48 of file TNeuron.h.

Public Types

enum  ENeuronType {
  kOff, kLinear, kSigmoid, kTanh,
  kGauss, kSoftmax, kExternal
}
 
- Public Types inherited from TObject
enum  EStatusBits {
  kCanDelete = BIT(0), kMustCleanup = BIT(3), kObjInCanvas = BIT(3), kIsReferenced = BIT(4),
  kHasUUID = BIT(5), kCannotPick = BIT(6), kNoContextMenu = BIT(8), kInvalidObject = BIT(13)
}
 
enum  { kIsOnHeap = 0x01000000, kNotDeleted = 0x02000000, kZombie = 0x04000000, kBitMask = 0x00ffffff }
 
enum  { kSingleKey = BIT(0), kOverwrite = BIT(1), kWriteDelete = BIT(2) }
 

Public Member Functions

 TNeuron (ENeuronType type=kSigmoid, const char *name="", const char *title="", const char *extF="", const char *extD="")
 
virtual ~TNeuron ()
 
TSynapseGetPre (Int_t n) const
 
TSynapseGetPost (Int_t n) const
 
TNeuronGetInLayer (Int_t n) const
 
TTreeFormulaUseBranch (TTree *, const char *)
 Sets a formula that can be used to make the neuron an input. More...
 
Double_t GetInput () const
 Returns neuron input. More...
 
Double_t GetValue () const
 Computes the output using the appropriate function and all the weighted inputs, or uses the branch as input. More...
 
Double_t GetDerivative () const
 computes the derivative for the appropriate function at the working point More...
 
Double_t GetError () const
 Computes the error for output neurons. More...
 
Double_t GetTarget () const
 Computes the normalized target pattern for output neurons. More...
 
Double_t GetDeDw () const
 Computes the derivative of the error wrt the neuron weight. More...
 
Double_t GetBranch () const
 Returns the formula value. More...
 
ENeuronType GetType () const
 Returns the neuron type. More...
 
void SetWeight (Double_t w)
 Sets the neuron weight to w. More...
 
Double_t GetWeight () const
 
void SetNormalisation (Double_t mean, Double_t RMS)
 Sets the normalization variables. More...
 
const Double_tGetNormalisation () const
 
void SetNewEvent () const
 Inform the neuron that inputs of the network have changed, so that the buffered values have to be recomputed. More...
 
void SetDEDw (Double_t in)
 Sets the derivative of the total error wrt the neuron weight. More...
 
Double_t GetDEDw () const
 
void ForceExternalValue (Double_t value)
 Uses the branch type to force an external value. More...
 
void AddInLayer (TNeuron *)
 Tells a neuron which neurons form its layer (including itself). More...
 
- Public Member Functions inherited from TNamed
 TNamed ()
 
 TNamed (const char *name, const char *title)
 
 TNamed (const TString &name, const TString &title)
 
 TNamed (const TNamed &named)
 
TNamedoperator= (const TNamed &rhs)
 TNamed assignment operator. More...
 
virtual ~TNamed ()
 
virtual void Clear (Option_t *option="")
 Set name and title to empty strings (""). More...
 
virtual TObjectClone (const char *newname="") const
 Make a clone of an object using the Streamer facility. More...
 
virtual Int_t Compare (const TObject *obj) const
 Compare two TNamed objects. More...
 
virtual void Copy (TObject &named) const
 Copy this to obj. More...
 
virtual void FillBuffer (char *&buffer)
 Encode TNamed into output buffer. More...
 
virtual const char * GetName () const
 Returns name of object. More...
 
virtual const char * GetTitle () const
 Returns title of object. More...
 
virtual ULong_t Hash () const
 Return hash value for this object. More...
 
virtual Bool_t IsSortable () const
 
virtual void SetName (const char *name)
 Change (i.e. More...
 
virtual void SetNameTitle (const char *name, const char *title)
 Change (i.e. set) all the TNamed parameters (name and title). More...
 
virtual void SetTitle (const char *title="")
 Change (i.e. set) the title of the TNamed. More...
 
virtual void ls (Option_t *option="") const
 List TNamed name and title. More...
 
virtual void Print (Option_t *option="") const
 Print TNamed name and title. More...
 
virtual Int_t Sizeof () const
 Return size of the TNamed part of the TObject. More...
 
- Public Member Functions inherited from TObject
 TObject ()
 
 TObject (const TObject &object)
 TObject copy ctor. More...
 
TObjectoperator= (const TObject &rhs)
 TObject assignment operator. More...
 
virtual ~TObject ()
 TObject destructor. More...
 
virtual void AppendPad (Option_t *option="")
 Append graphics object to current pad. More...
 
virtual void Browse (TBrowser *b)
 Browse object. May be overridden for another default action. More...
 
virtual const char * ClassName () const
 Returns name of class to which the object belongs. More...
 
virtual void Delete (Option_t *option="")
 Delete this object. More...
 
virtual Int_t DistancetoPrimitive (Int_t px, Int_t py)
 Computes distance from point (px,py) to the object. More...
 
virtual void Draw (Option_t *option="")
 Default Draw method for all objects. More...
 
virtual void DrawClass () const
 Draw class inheritance tree of the class to which this object belongs. More...
 
virtual TObjectDrawClone (Option_t *option="") const
 Draw a clone of this object in the current pad. More...
 
virtual void Dump () const
 Dump contents of object on stdout. More...
 
virtual void Execute (const char *method, const char *params, Int_t *error=0)
 Execute method on this object with the given parameter string, e.g. More...
 
virtual void Execute (TMethod *method, TObjArray *params, Int_t *error=0)
 Execute method on this object with parameters stored in the TObjArray. More...
 
virtual void ExecuteEvent (Int_t event, Int_t px, Int_t py)
 Execute action corresponding to an event at (px,py). More...
 
virtual TObjectFindObject (const char *name) const
 Must be redefined in derived classes. More...
 
virtual TObjectFindObject (const TObject *obj) const
 Must be redefined in derived classes. More...
 
virtual Option_tGetDrawOption () const
 Get option used by the graphics system to draw this object. More...
 
virtual UInt_t GetUniqueID () const
 Return the unique object id. More...
 
virtual const char * GetIconName () const
 Returns mime type name of object. More...
 
virtual Option_tGetOption () const
 
virtual char * GetObjectInfo (Int_t px, Int_t py) const
 Returns string containing info about the object at position (px,py). More...
 
virtual Bool_t HandleTimer (TTimer *timer)
 Execute action in response of a timer timing out. More...
 
virtual Bool_t InheritsFrom (const char *classname) const
 Returns kTRUE if object inherits from class "classname". More...
 
virtual Bool_t InheritsFrom (const TClass *cl) const
 Returns kTRUE if object inherits from TClass cl. More...
 
virtual void Inspect () const
 Dump contents of this object in a graphics canvas. More...
 
virtual Bool_t IsFolder () const
 Returns kTRUE in case object contains browsable objects (like containers or lists of other objects). More...
 
virtual Bool_t IsEqual (const TObject *obj) const
 Default equal comparison (objects are equal if they have the same address in memory). More...
 
Bool_t IsOnHeap () const
 
Bool_t IsZombie () const
 
virtual Bool_t Notify ()
 This method must be overridden to handle object notification. More...
 
virtual void Paint (Option_t *option="")
 This method must be overridden if a class wants to paint itself. More...
 
virtual void Pop ()
 Pop on object drawn in a pad to the top of the display list. More...
 
virtual Int_t Read (const char *name)
 Read contents of object with specified name from the current directory. More...
 
virtual void RecursiveRemove (TObject *obj)
 Recursively remove this object from a list. More...
 
virtual void SaveAs (const char *filename="", Option_t *option="") const
 Save this object in the file specified by filename. More...
 
virtual void SavePrimitive (std::ostream &out, Option_t *option="")
 Save a primitive as a C++ statement(s) on output stream "out". More...
 
virtual void SetDrawOption (Option_t *option="")
 Set drawing option for object. More...
 
virtual void SetUniqueID (UInt_t uid)
 Set the unique object id. More...
 
virtual void UseCurrentStyle ()
 Set current style settings in this object This function is called when either TCanvas::UseCurrentStyle or TROOT::ForceStyle have been invoked. More...
 
virtual Int_t Write (const char *name=0, Int_t option=0, Int_t bufsize=0)
 Write this object to the current directory. More...
 
virtual Int_t Write (const char *name=0, Int_t option=0, Int_t bufsize=0) const
 Write this object to the current directory. More...
 
voidoperator new (size_t sz)
 
voidoperator new[] (size_t sz)
 
voidoperator new (size_t sz, void *vp)
 
voidoperator new[] (size_t sz, void *vp)
 
void operator delete (void *ptr)
 Operator delete. More...
 
void operator delete[] (void *ptr)
 Operator delete []. More...
 
void SetBit (UInt_t f, Bool_t set)
 Set or unset the user status bits as specified in f. More...
 
void SetBit (UInt_t f)
 
void ResetBit (UInt_t f)
 
Bool_t TestBit (UInt_t f) const
 
Int_t TestBits (UInt_t f) const
 
void InvertBit (UInt_t f)
 
virtual void Info (const char *method, const char *msgfmt,...) const
 Issue info message. More...
 
virtual void Warning (const char *method, const char *msgfmt,...) const
 Issue warning message. More...
 
virtual void Error (const char *method, const char *msgfmt,...) const
 Issue error message. More...
 
virtual void SysError (const char *method, const char *msgfmt,...) const
 Issue system error message. More...
 
virtual void Fatal (const char *method, const char *msgfmt,...) const
 Issue fatal error message. More...
 
void AbstractMethod (const char *method) const
 Use this method to implement an "abstract" method that you don't want to leave purely abstract. More...
 
void MayNotUse (const char *method) const
 Use this method to signal that a method (defined in a base class) may not be called in a derived class (in principle against good design since a child class should not provide less functionality than its parent, however, sometimes it is necessary). More...
 
void Obsolete (const char *method, const char *asOfVers, const char *removedFromVers) const
 Use this method to declare a method obsolete. More...
 

Protected Member Functions

Double_t Sigmoid (Double_t x) const
 The Sigmoid. More...
 
Double_t DSigmoid (Double_t x) const
 The Derivative of the Sigmoid. More...
 
void AddPre (TSynapse *)
 Adds a synapse to the neuron as an input This method is used by the TSynapse while connecting two neurons. More...
 
void AddPost (TSynapse *)
 Adds a synapse to the neuron as an output This method is used by the TSynapse while connecting two neurons. More...
 
- Protected Member Functions inherited from TObject
void MakeZombie ()
 
virtual void DoError (int level, const char *location, const char *fmt, va_list va) const
 Interface to ErrorHandler (protected). More...
 

Private Member Functions

 TNeuron (const TNeuron &)
 
TNeuronoperator= (const TNeuron &)
 

Private Attributes

TObjArray fpre
 
TObjArray fpost
 
TObjArray flayer
 
Double_t fWeight
 
Double_t fNorm [2]
 
ENeuronType fType
 
TFormulafExtF
 
TFormulafExtD
 
TTreeFormulafFormula
 
Int_t fIndex
 formula to be used for inputs and outputs More...
 
Bool_t fNewInput
 index in the formula More...
 
Double_t fInput
 do we need to compute fInput again ? More...
 
Bool_t fNewValue
 buffer containing the last neuron input More...
 
Double_t fValue
 do we need to compute fValue again ? More...
 
Bool_t fNewDeriv
 buffer containing the last neuron output More...
 
Double_t fDerivative
 do we need to compute fDerivative again ? More...
 
Bool_t fNewDeDw
 buffer containing the last neuron derivative More...
 
Double_t fDeDw
 do we need to compute fDeDw again ? More...
 
Double_t fDEDw
 buffer containing the last derivative of the error More...
 

Friends

class TSynapse
 

Additional Inherited Members

- Static Public Member Functions inherited from TObject
static Long_t GetDtorOnly ()
 Return destructor only flag. More...
 
static void SetDtorOnly (void *obj)
 Set destructor only flag. More...
 
static Bool_t GetObjectStat ()
 Get status of object stat flag. More...
 
static void SetObjectStat (Bool_t stat)
 Turn on/off tracking of objects in the TObjectTable. More...
 
- Protected Attributes inherited from TNamed
TString fName
 
TString fTitle
 

#include <TMVA/TNeuron.h>

Inheritance diagram for TNeuron:
[legend]

Member Enumeration Documentation

Enumerator
kOff 
kLinear 
kSigmoid 
kTanh 
kGauss 
kSoftmax 
kExternal 

Definition at line 52 of file TNeuron.h.

Constructor & Destructor Documentation

TNeuron::TNeuron ( ENeuronType  type = kSigmoid,
const char *  name = "",
const char *  title = "",
const char *  extF = "",
const char *  extD = "" 
)
virtual TNeuron::~TNeuron ( )
inlinevirtual

Definition at line 57 of file TNeuron.h.

TNeuron::TNeuron ( const TNeuron )
private

Member Function Documentation

void TNeuron::AddInLayer ( TNeuron nearP)

Tells a neuron which neurons form its layer (including itself).

This is needed for self-normalizing functions, like Softmax.

Definition at line 857 of file TNeuron.cxx.

Referenced by TMultiLayerPerceptron::BuildLastLayer(), and TMultiLayerPerceptron::BuildOneHiddenLayer().

void TNeuron::AddPost ( TSynapse post)
protected

Adds a synapse to the neuron as an output This method is used by the TSynapse while connecting two neurons.

Definition at line 846 of file TNeuron.cxx.

Referenced by TSynapse::SetPre(), and TSynapse::TSynapse().

void TNeuron::AddPre ( TSynapse pre)
protected

Adds a synapse to the neuron as an input This method is used by the TSynapse while connecting two neurons.

Definition at line 834 of file TNeuron.cxx.

Referenced by TSynapse::SetPost(), and TSynapse::TSynapse().

Double_t TNeuron::DSigmoid ( Double_t  x) const
protected

The Derivative of the Sigmoid.

Definition at line 818 of file TNeuron.cxx.

Referenced by GetDerivative().

void TNeuron::ForceExternalValue ( Double_t  value)

Uses the branch type to force an external value.

Definition at line 1125 of file TNeuron.cxx.

Referenced by TMultiLayerPerceptron::Evaluate().

Double_t TNeuron::GetBranch ( ) const

Returns the formula value.

Definition at line 914 of file TNeuron.cxx.

Referenced by TMultiLayerPerceptron::DrawResult(), GetError(), GetTarget(), and GetValue().

Double_t TNeuron::GetDeDw ( ) const

Computes the derivative of the error wrt the neuron weight.

Definition at line 1084 of file TNeuron.cxx.

Referenced by TMultiLayerPerceptron::ComputeDEDw(), TSynapse::GetDeDw(), GetDeDw(), and TMultiLayerPerceptron::MLP_Stochastic().

Double_t TNeuron::GetDEDw ( ) const
inline
Double_t TNeuron::GetDerivative ( ) const

computes the derivative for the appropriate function at the working point

Definition at line 1011 of file TNeuron.cxx.

Referenced by GetDeDw().

Double_t TNeuron::GetError ( ) const

Computes the error for output neurons.

Returns 0 for other neurons.

Definition at line 1063 of file TNeuron.cxx.

Referenced by GetDeDw(), and TMultiLayerPerceptron::GetSumSquareError().

TNeuron* TNeuron::GetInLayer ( Int_t  n) const
inline

Definition at line 60 of file TNeuron.h.

Referenced by TMultiLayerPerceptron::Export().

Double_t TNeuron::GetInput ( ) const

Returns neuron input.

Definition at line 925 of file TNeuron.cxx.

Referenced by GetDeDw(), and GetValue().

const Double_t* TNeuron::GetNormalisation ( ) const
inline

Definition at line 73 of file TNeuron.h.

Referenced by TMultiLayerPerceptron::DrawResult(), and TMultiLayerPerceptron::Export().

TSynapse* TNeuron::GetPost ( Int_t  n) const
inline

Definition at line 59 of file TNeuron.h.

TSynapse* TNeuron::GetPre ( Int_t  n) const
inline

Definition at line 58 of file TNeuron.h.

Referenced by TMultiLayerPerceptron::Export().

Double_t TNeuron::GetTarget ( ) const

Computes the normalized target pattern for output neurons.

Returns 0 for other neurons.

Definition at line 1074 of file TNeuron.cxx.

Referenced by TMultiLayerPerceptron::GetCrossEntropy(), and TMultiLayerPerceptron::GetCrossEntropyBinary().

TNeuron::ENeuronType TNeuron::GetType ( ) const

Returns the neuron type.

Definition at line 867 of file TNeuron.cxx.

Referenced by TMultiLayerPerceptron::Export().

Double_t TNeuron::GetValue ( ) const

Computes the output using the appropriate function and all the weighted inputs, or uses the branch as input.

In that case, the branch normalisation is also used.

Definition at line 948 of file TNeuron.cxx.

Referenced by TMultiLayerPerceptron::DrawResult(), TMultiLayerPerceptron::Evaluate(), TMultiLayerPerceptron::GetCrossEntropy(), TMultiLayerPerceptron::GetCrossEntropyBinary(), TSynapse::GetDeDw(), GetDerivative(), GetError(), TSynapse::GetValue(), and TMultiLayerPerceptron::Result().

Double_t TNeuron::GetWeight ( ) const
inline
TNeuron& TNeuron::operator= ( const TNeuron )
private
void TNeuron::SetDEDw ( Double_t  in)

Sets the derivative of the total error wrt the neuron weight.

Definition at line 1168 of file TNeuron.cxx.

Referenced by TMultiLayerPerceptron::ComputeDEDw().

void TNeuron::SetNewEvent ( ) const

Inform the neuron that inputs of the network have changed, so that the buffered values have to be recomputed.

Definition at line 1157 of file TNeuron.cxx.

Referenced by TMultiLayerPerceptron::Evaluate(), and TMultiLayerPerceptron::GetEntry().

void TNeuron::SetNormalisation ( Double_t  mean,
Double_t  RMS 
)

Sets the normalization variables.

Any input neuron will return (branch-mean)/RMS. When UseBranch is called, mean and RMS are automatically set to the actual branch mean and RMS.

Definition at line 1137 of file TNeuron.cxx.

Referenced by TMultiLayerPerceptron::AttachData(), and TMultiLayerPerceptron::LoadWeights().

void TNeuron::SetWeight ( Double_t  w)

Sets the neuron weight to w.

The neuron weight corresponds to the bias in the linear combination of the inputs.

Definition at line 1148 of file TNeuron.cxx.

Referenced by TMultiLayerPerceptron::LoadWeights(), TMultiLayerPerceptron::MLP_Batch(), TMultiLayerPerceptron::MLP_Line(), TMultiLayerPerceptron::MLP_Stochastic(), and TMultiLayerPerceptron::Randomize().

Double_t TNeuron::Sigmoid ( Double_t  x) const
protected

The Sigmoid.

Fast computation of the values of the sigmoid function. Uses values of the function up to the seventh order tabulated at 700 points. Values were computed in long double precision (16 bytes, precision to about 37 digits) on a hp computer. Some values were checked with Mathematica. Result should be correct to ~ 15 digits (about double precision)

From the mlpfit package (J.Schwindling 20-Jul-1999)

Definition at line 95 of file TNeuron.cxx.

Referenced by GetValue().

TTreeFormula * TNeuron::UseBranch ( TTree input,
const char *  formula 
)

Sets a formula that can be used to make the neuron an input.

The formula is automatically normalized to mean=0, RMS=1. This normalisation is used by GetValue() (input neurons) and GetError() (output neurons)

Definition at line 878 of file TNeuron.cxx.

Referenced by TMultiLayerPerceptron::AttachData().

Friends And Related Function Documentation

friend class TSynapse
friend

Definition at line 49 of file TNeuron.h.

Member Data Documentation

Double_t TNeuron::fDeDw
private

do we need to compute fDeDw again ?

Definition at line 109 of file TNeuron.h.

Referenced by GetDeDw().

Double_t TNeuron::fDEDw
private

buffer containing the last derivative of the error

Definition at line 110 of file TNeuron.h.

Referenced by SetDEDw().

Double_t TNeuron::fDerivative
private

do we need to compute fDerivative again ?

Definition at line 107 of file TNeuron.h.

Referenced by GetDerivative().

TFormula* TNeuron::fExtD
private

Definition at line 97 of file TNeuron.h.

Referenced by GetDerivative().

TFormula* TNeuron::fExtF
private

Definition at line 96 of file TNeuron.h.

Referenced by GetValue().

TTreeFormula* TNeuron::fFormula
private

Definition at line 100 of file TNeuron.h.

Referenced by GetBranch(), and UseBranch().

Int_t TNeuron::fIndex
private

formula to be used for inputs and outputs

Definition at line 101 of file TNeuron.h.

Referenced by GetBranch(), and UseBranch().

Double_t TNeuron::fInput
private

do we need to compute fInput again ?

Definition at line 103 of file TNeuron.h.

Referenced by GetInput().

TObjArray TNeuron::flayer
private

Definition at line 92 of file TNeuron.h.

Referenced by AddInLayer(), and GetValue().

Bool_t TNeuron::fNewDeDw
private

buffer containing the last neuron derivative

Definition at line 108 of file TNeuron.h.

Referenced by GetDeDw().

Bool_t TNeuron::fNewDeriv
private

buffer containing the last neuron output

Definition at line 106 of file TNeuron.h.

Referenced by GetDerivative().

Bool_t TNeuron::fNewInput
private

index in the formula

Definition at line 102 of file TNeuron.h.

Referenced by GetInput().

Bool_t TNeuron::fNewValue
private

buffer containing the last neuron input

Definition at line 104 of file TNeuron.h.

Referenced by ForceExternalValue(), and GetValue().

Double_t TNeuron::fNorm[2]
private

Definition at line 94 of file TNeuron.h.

Referenced by ForceExternalValue(), GetError(), GetTarget(), GetValue(), SetNormalisation(), and UseBranch().

TObjArray TNeuron::fpost
private

Definition at line 91 of file TNeuron.h.

Referenced by AddPost(), GetDeDw(), GetError(), and GetTarget().

TObjArray TNeuron::fpre
private

Definition at line 90 of file TNeuron.h.

Referenced by AddPre(), GetDerivative(), GetInput(), and GetValue().

ENeuronType TNeuron::fType
private

Definition at line 95 of file TNeuron.h.

Referenced by GetDeDw(), GetDerivative(), GetType(), and GetValue().

Double_t TNeuron::fValue
private

do we need to compute fValue again ?

Definition at line 105 of file TNeuron.h.

Referenced by ForceExternalValue(), and GetValue().

Double_t TNeuron::fWeight
private

Definition at line 93 of file TNeuron.h.

Referenced by GetDerivative(), GetInput(), and SetWeight().

Collaboration diagram for TNeuron:
[legend]

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