Detailed Description

Computes the Tensor Product Pair Kernel (TPPK).

Formally, it computes

$k_{\mbox{tppk}}(({\bf a},{\bf b}), ({\bf c},{\bf d}))= k({\bf a}, {\bf c})\cdot k({\bf b}, {\bf c}) + k({\bf a},{\bf d})\cdot k({\bf b}, {\bf c})$

It is defined on pairs of inputs and a subkernel $k$ . The subkernel has to be given on initialization. The pairs are specified via indizes (ab)using 2-dimensional integer features.

Its feature space $\Phi_{\mbox{tppk}}$ is the tensor product of the feature spaces of the subkernel $k(.,.)$ on its input.

It is often used in bioinformatics, e.g., to predict protein-protein interactions.

Definition at line 37 of file TensorProductPairKernel.h.

Inheritance diagram for CTensorProductPairKernel:

[legend]

List of all members.

Public Member Functions
	CTensorProductPairKernel (void)
	CTensorProductPairKernel (int32_t size, CKernel *subkernel)
	CTensorProductPairKernel (CSimpleFeatures< int32_t > l, CSimpleFeatures< int32_t > r, CKernel *subkernel)
virtual	~CTensorProductPairKernel ()
virtual bool	init (CFeatures l, CFeatures r)
virtual EKernelType	get_kernel_type ()
virtual void	register_params ()
virtual const char *	get_name () const
virtual EFeatureClass	get_feature_class ()
virtual EFeatureType	get_feature_type ()
Protected Member Functions
virtual float64_t	compute (int32_t idx_a, int32_t idx_b)
Protected Attributes
CKernel *	subkernel

Constructor & Destructor Documentation

CTensorProductPairKernel ( void )

default constructor

Definition at line 19 of file TensorProductPairKernel.cpp.

CTensorProductPairKernel	(	int32_t	size,
		CKernel *	subkernel
	)

constructor

Parameters:

	size	cache size
	subkernel	the subkernel

Definition at line 25 of file TensorProductPairKernel.cpp.

CTensorProductPairKernel	(	CSimpleFeatures< int32_t > *	l,
		CSimpleFeatures< int32_t > *	r,
		CKernel *	subkernel
	)

constructor

Parameters:

	l	features of left-hand side
	r	features of right-hand side
	subkernel	the subkernel

Definition at line 32 of file TensorProductPairKernel.cpp.

~CTensorProductPairKernel ( ) [virtual]

Definition at line 40 of file TensorProductPairKernel.cpp.

Member Function Documentation

float64_t compute	(	int32_t	idx_a,
		int32_t	idx_b
	)			`[protected, virtual]`

compute kernel function for features a and b idx_{a,b} denote the index of the feature vectors in the corresponding feature object

Parameters:

	idx_a	index a
	idx_b	index b

Returns:: computed kernel function at indices a,b

Reimplemented from CDotKernel.

Definition at line 53 of file TensorProductPairKernel.cpp.

virtual EFeatureClass get_feature_class ( ) [virtual]

return feature class the kernel can deal with

Returns:: feature class SIMPLE

Reimplemented from CDotKernel.

Definition at line 88 of file TensorProductPairKernel.h.

virtual EFeatureType get_feature_type ( ) [virtual]

return feature type the kernel can deal with

Returns:: int32_t feature type

Reimplemented from CDotKernel.

Definition at line 94 of file TensorProductPairKernel.h.

virtual EKernelType get_kernel_type ( ) [virtual]

return what type of kernel we are

Returns:: kernel type TPPK

Implements CDotKernel.

Definition at line 72 of file TensorProductPairKernel.h.

virtual const char* get_name ( void ) const [virtual]

return the kernel's name

Returns:: name TPPK

Reimplemented from CDotKernel.

Definition at line 82 of file TensorProductPairKernel.h.

bool init	(	CFeatures *	l,
		CFeatures *	r
	)			`[virtual]`

initialize kernel

Parameters:

	l	features of left-hand side
	r	features of right-hand side

Returns:: if initializing was successful

Reimplemented from CDotKernel.

Definition at line 46 of file TensorProductPairKernel.cpp.

void register_params ( ) [virtual]

Separate the function of parameter registration This can be the first stage of a *general* framework for cross-validation or other parameter-based operations

Reimplemented from CKernel.

Definition at line 80 of file TensorProductPairKernel.cpp.

Member Data Documentation

CKernel* subkernel [protected]

the subkernel

Definition at line 109 of file TensorProductPairKernel.h.

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

CTensorProductPairKernel Class Reference

Detailed Description

Public Member Functions

Protected Member Functions

Protected Attributes

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation