Features that support dot products among other operations.
DotFeatures support the following operations:
Definition at line 43 of file DotFeatures.h.
Public Member Functions | |
CDotFeatures (int32_t size=0) | |
CDotFeatures (const CDotFeatures &orig) | |
CDotFeatures (CFile *loader) | |
virtual | ~CDotFeatures () |
virtual int32_t | get_dim_feature_space ()=0 |
virtual float64_t | dot (int32_t vec_idx1, int32_t vec_idx2)=0 |
virtual float64_t | dense_dot (int32_t vec_idx1, const float64_t *vec2, int32_t vec2_len)=0 |
virtual void | add_to_dense_vec (float64_t alpha, int32_t vec_idx1, float64_t *vec2, int32_t vec2_len, bool abs_val=false)=0 |
virtual void | dense_dot_range (float64_t *output, int32_t start, int32_t stop, float64_t *alphas, float64_t *vec, int32_t dim, float64_t b) |
virtual void | dense_dot_range_subset (int32_t *sub_index, int32_t num, float64_t *output, float64_t *alphas, float64_t *vec, int32_t dim, float64_t b) |
virtual int32_t | get_nnz_features_for_vector (int32_t num)=0 |
float64_t | get_combined_feature_weight () |
void | set_combined_feature_weight (float64_t nw) |
virtual void | get_feature_matrix (float64_t **dst, int32_t *num_feat, int32_t *num_vec) |
virtual void | get_feature_vector (float64_t **dst, int32_t *len, int32_t num) |
void | benchmark_add_to_dense_vector (int32_t repeats=5) |
void | benchmark_dense_dot_range (int32_t repeats=5) |
virtual void * | get_feature_iterator (int32_t vector_index)=0 |
virtual bool | get_next_feature (int32_t &index, float64_t &value, void *iterator)=0 |
virtual void | free_feature_iterator (void *iterator)=0 |
Static Public Member Functions | |
static void * | dense_dot_range_helper (void *p) |
Protected Member Functions | |
void | display_progress (int32_t start, int32_t stop, int32_t v) |
Protected Attributes | |
float64_t | combined_weight |
feature weighting in combined dot features |
CDotFeatures | ( | int32_t | size = 0 ) |
CDotFeatures | ( | const CDotFeatures & | orig ) |
copy constructor
Definition at line 57 of file DotFeatures.h.
CDotFeatures | ( | CFile * | loader ) |
constructor
loader | File object via which to load data |
Definition at line 64 of file DotFeatures.h.
virtual ~CDotFeatures | ( | ) | [virtual] |
Definition at line 66 of file DotFeatures.h.
virtual void add_to_dense_vec | ( | float64_t | alpha, |
int32_t | vec_idx1, | ||
float64_t * | vec2, | ||
int32_t | vec2_len, | ||
bool | abs_val = false |
||
) | [pure virtual] |
add vector 1 multiplied with alpha to dense vector2
alpha | scalar alpha |
vec_idx1 | index of first vector |
vec2 | pointer to real valued vector |
vec2_len | length of real valued vector |
abs_val | if true add the absolute value |
Implemented in CCombinedDotFeatures, CExplicitSpecFeatures, CHashedWDFeatures, CHashedWDFeaturesTransposed, CImplicitWeightedSpecFeatures, CPolyFeatures, CSimpleFeatures< ST >, CSNPFeatures, CSparseFeatures< ST >, CSparsePolyFeatures, CWDFeatures, CSimpleFeatures< float64_t >, CSimpleFeatures< uint16_t >, and CSparseFeatures< float64_t >.
void benchmark_add_to_dense_vector | ( | int32_t | repeats = 5 ) |
run benchmark for add_to_dense_vec
Definition at line 290 of file DotFeatures.cpp.
void benchmark_dense_dot_range | ( | int32_t | repeats = 5 ) |
run benchmark for dense_dot_range
Definition at line 313 of file DotFeatures.cpp.
virtual float64_t dense_dot | ( | int32_t | vec_idx1, |
const float64_t * | vec2, | ||
int32_t | vec2_len | ||
) | [pure virtual] |
compute dot product between vector1 and a dense vector
vec_idx1 | index of first vector |
vec2 | pointer to real valued vector |
vec2_len | length of real valued vector |
Implemented in CCombinedDotFeatures, CExplicitSpecFeatures, CHashedWDFeatures, CHashedWDFeaturesTransposed, CImplicitWeightedSpecFeatures, CPolyFeatures, CSimpleFeatures< ST >, CSNPFeatures, CSparseFeatures< ST >, CSparsePolyFeatures, CWDFeatures, CSimpleFeatures< float64_t >, CSimpleFeatures< uint16_t >, and CSparseFeatures< float64_t >.
void dense_dot_range | ( | float64_t * | output, |
int32_t | start, | ||
int32_t | stop, | ||
float64_t * | alphas, | ||
float64_t * | vec, | ||
int32_t | dim, | ||
float64_t | b | ||
) | [virtual] |
Compute the dot product for a range of vectors. This function makes use of dense_dot alphas[i] * sparse[i]^T * w + b
output | result for the given vector range |
start | start vector range from this idx |
stop | stop vector range at this idx |
alphas | scalars to multiply with, may be NULL |
vec | dense vector to compute dot product with |
dim | length of the dense vector |
b | bias |
note that the result will be written to output[0...(stop-start-1)]
Reimplemented in CCombinedDotFeatures, and CHashedWDFeaturesTransposed.
Definition at line 38 of file DotFeatures.cpp.
void * dense_dot_range_helper | ( | void * | p ) | [static] |
Compute the dot product for a range of vectors. This function is called by the threads created in dense_dot_range
Reimplemented in CHashedWDFeaturesTransposed.
Definition at line 202 of file DotFeatures.cpp.
void dense_dot_range_subset | ( | int32_t * | sub_index, |
int32_t | num, | ||
float64_t * | output, | ||
float64_t * | alphas, | ||
float64_t * | vec, | ||
int32_t | dim, | ||
float64_t | b | ||
) | [virtual] |
Compute the dot product for a subset of vectors. This function makes use of dense_dot alphas[i] * sparse[i]^T * w + b
sub_index | index for which to compute outputs |
num | length of index |
output | result for the given vector range |
alphas | scalars to multiply with, may be NULL |
vec | dense vector to compute dot product with |
dim | length of the dense vector |
b | bias |
Reimplemented in CCombinedDotFeatures, and CHashedWDFeaturesTransposed.
Definition at line 124 of file DotFeatures.cpp.
void display_progress | ( | int32_t | start, |
int32_t | stop, | ||
int32_t | v | ||
) | [protected] |
display progress output
start | minimum value |
stop | maximum value |
v | current value |
Definition at line 217 of file DotFeatures.h.
virtual float64_t dot | ( | int32_t | vec_idx1, |
int32_t | vec_idx2 | ||
) | [pure virtual] |
compute dot product between vector1 and vector2, appointed by their indices
vec_idx1 | index of first vector |
vec_idx2 | index of second vector |
Implemented in CCombinedDotFeatures, CExplicitSpecFeatures, CHashedWDFeatures, CHashedWDFeaturesTransposed, CImplicitWeightedSpecFeatures, CPolyFeatures, CSimpleFeatures< ST >, CSNPFeatures, CSparseFeatures< ST >, CSparsePolyFeatures, CWDFeatures, CSimpleFeatures< float64_t >, CSimpleFeatures< uint16_t >, and CSparseFeatures< float64_t >.
virtual void free_feature_iterator | ( | void * | iterator ) | [pure virtual] |
clean up iterator call this function with the iterator returned by get_first_feature
iterator | as returned by get_first_feature |
Implemented in CCombinedDotFeatures, CExplicitSpecFeatures, CHashedWDFeatures, CHashedWDFeaturesTransposed, CImplicitWeightedSpecFeatures, CPolyFeatures, CSimpleFeatures< ST >, CSNPFeatures, CSparseFeatures< ST >, CSparsePolyFeatures, CWDFeatures, CSimpleFeatures< float64_t >, CSimpleFeatures< uint16_t >, and CSparseFeatures< float64_t >.
float64_t get_combined_feature_weight | ( | ) |
get combined feature weight
Definition at line 148 of file DotFeatures.h.
virtual int32_t get_dim_feature_space | ( | ) | [pure virtual] |
obtain the dimensionality of the feature space
(not mix this up with the dimensionality of the input space, usually obtained via get_num_features())
Implemented in CCombinedDotFeatures, CExplicitSpecFeatures, CHashedWDFeatures, CHashedWDFeaturesTransposed, CImplicitWeightedSpecFeatures, CPolyFeatures, CSimpleFeatures< ST >, CSNPFeatures, CSparseFeatures< ST >, CSparsePolyFeatures, CWDFeatures, CSimpleFeatures< float64_t >, CSimpleFeatures< uint16_t >, and CSparseFeatures< float64_t >.
virtual void* get_feature_iterator | ( | int32_t | vector_index ) | [pure virtual] |
iterate over the non-zero features
call get_feature_iterator first, followed by get_next_feature and free_feature_iterator to cleanup
vector_index | the index of the vector over whose components to iterate over |
Implemented in CCombinedDotFeatures, CExplicitSpecFeatures, CHashedWDFeatures, CHashedWDFeaturesTransposed, CImplicitWeightedSpecFeatures, CPolyFeatures, CSimpleFeatures< ST >, CSNPFeatures, CSparseFeatures< ST >, CSparsePolyFeatures, CWDFeatures, CSimpleFeatures< float64_t >, CSimpleFeatures< uint16_t >, and CSparseFeatures< float64_t >.
void get_feature_matrix | ( | float64_t ** | dst, |
int32_t * | num_feat, | ||
int32_t * | num_vec | ||
) | [virtual] |
get a copy of the feature matrix (in feature space) num_feat,num_vectors are returned by reference
dst | destination to store matrix in |
num_feat | number of features (rows of matrix) |
num_vec | number of vectors (columns of matrix) |
Reimplemented in CSimpleFeatures< float64_t >.
Definition at line 255 of file DotFeatures.cpp.
void get_feature_vector | ( | float64_t ** | dst, |
int32_t * | len, | ||
int32_t | num | ||
) | [virtual] |
get a copy of the feature matrix (in feature space) num_feat,num_vectors are returned by reference
dst | destination to store matrix in |
len | number of features |
num | index of vector |
Reimplemented in CSimpleFeatures< float64_t >.
Definition at line 277 of file DotFeatures.cpp.
virtual bool get_next_feature | ( | int32_t & | index, |
float64_t & | value, | ||
void * | iterator | ||
) | [pure virtual] |
iterate over the non-zero features
call this function with the iterator returned by get_first_feature and call free_feature_iterator to cleanup
index | is returned by reference (-1 when not available) |
value | is returned by reference |
iterator | as returned by get_first_feature |
Implemented in CCombinedDotFeatures, CExplicitSpecFeatures, CHashedWDFeatures, CHashedWDFeaturesTransposed, CImplicitWeightedSpecFeatures, CPolyFeatures, CSimpleFeatures< ST >, CSNPFeatures, CSparseFeatures< ST >, CSparsePolyFeatures, CWDFeatures, CSimpleFeatures< float64_t >, CSimpleFeatures< uint16_t >, and CSparseFeatures< float64_t >.
virtual int32_t get_nnz_features_for_vector | ( | int32_t | num ) | [pure virtual] |
get number of non-zero features in vector
(in case accurate estimates are too expensive overestimating is OK)
num | which vector |
Implemented in CCombinedDotFeatures, CExplicitSpecFeatures, CHashedWDFeatures, CHashedWDFeaturesTransposed, CImplicitWeightedSpecFeatures, CPolyFeatures, CSimpleFeatures< ST >, CSNPFeatures, CSparseFeatures< ST >, CSparsePolyFeatures, CWDFeatures, CSimpleFeatures< float64_t >, CSimpleFeatures< uint16_t >, and CSparseFeatures< float64_t >.
void set_combined_feature_weight | ( | float64_t | nw ) |
set combined kernel weight
nw | new combined feature weight |
Definition at line 154 of file DotFeatures.h.
float64_t combined_weight [protected] |
feature weighting in combined dot features
Definition at line 248 of file DotFeatures.h.