Defines the interface for a joint feature mapping $\phi : \mathbb{R} \times \mathbb{Z} \rightarrow \mathbb{R}^m$ . More...

Inheritance diagram for drwnJointFeatureMap:

Public Member Functions
	drwnJointFeatureMap ()
	default constructor

	drwnJointFeatureMap (int nFeatures, int nClasses)
	construct with known number of input features and classes

virtual	~drwnJointFeatureMap ()
	destructor

virtual drwnJointFeatureMap *	clone () const =0
	returns a copy of the class usually implemented as virtual Foo* clone() { return new Foo(*this); }

int	numFeatures () const
	returns the number of features in the input space

int	numClasses () const
	returns the number of classes

virtual int	numParameters () const =0
	returns the number of features in the (joint) output space

virtual void	initialize (int nFeatures, int nClasses)
	initialize number of classes and number of features

virtual vector< double >	operator() (const vector< double > &x, int y) const =0
	returns $\phi(x, y) \in \mathbb{R}^m$ where $x \in \mathbb{R}^n$

virtual vector< double >	operator() (const vector< double > &x) const
	returns $\sum_y \phi(x, y) \in \mathbb{R}^m$ (default behaviour is very inefficient)

virtual double	dot (const vector< double > &theta, const vector< double > &x, int y) const
	returns the dot product $\theta^T \phi(x, y)$ (default behaviour is very inefficient)

double	dot (const vector< double > &theta, const vector< double > &x) const
	returns the dot product $\sum_y \theta^T \phi(x, y)$ (default behaviour is very inefficient)

virtual void	mac (vector< double > &theta, const vector< double > &x, double alpha, int y) const
	provides multiply-accumulate operation $\theta = \theta + \alpha \phi(x, y)$ (default behaviour is very inefficient)

virtual void	mac (vector< double > &theta, const vector< double > &x, const vector< double > &alpha) const
	provides multiply-accumulate operation $\theta = \theta + \sum_y \alpha_y \phi(x, y)$ (default behaviour is very inefficient)

Public Member Functions inherited from drwnTypeable
virtual const char *	type () const =0
	returns object type as a string (e.g., Foo::type() { return "Foo"; })

Protected Attributes
int	_nFeatures
	number of input features

int	_nClasses
	number of class labels

Detailed Description

Defines the interface for a joint feature mapping $\phi : \mathbb{R} \times \mathbb{Z} \rightarrow \mathbb{R}^m$ .

Warning: The default behaviour of all virtual functions are very inefficient and should be replaced in the derived classes. They are provided for testing during development, requiring the programmer to only implement the operator()(const vector<double>&x, double y) function.

See Also: drwnFeatureMap; Feature Space Mappings

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

drwnFeatureMaps.h

Public Member Functions

Protected Attributes

Detailed Description