This feature generator assigns a feature for every combination of attributes and labels that exist in the training data. The number of features is the unique number of combinations between attributes and labels. A conversion between attribute-label space and feature space is slower than dense_feature_generator_base, but feature space will be compact.
| attribute_tmpl | The type of an attribute. | |
| label_tmpl | The type of a label. | |
| feature_tmpl | The type of a feature. |
Public Types | |
| typedef attribute_tmpl | attribute_type |
| The type of an attribute. | |
| typedef label_tmpl | label_type |
| The type of a label. | |
| typedef feature_tmpl | feature_type |
| The type of a feature. | |
Public Member Functions | |
| sparse_feature_generator_base () | |
| Constructs an object. | |
| virtual | ~sparse_feature_generator_base () |
| Destructs an object. | |
| const char * | name () const |
| Returns the name of the feature generator. | |
| size_t | num_labels () const |
| Returns the total number of labels. | |
| size_t | num_features () const |
| Returns the total number of features. | |
| void | set_num_attributes (size_t num_attributes) |
| Sets the total number of attributes. | |
| void | set_num_labels (size_t num_labels) |
| Sets the total number of labels. | |
| bool | needs_registration () const |
| Returns if this class requires registration. | |
| feature_type | regist (const attribute_type &a, const label_type &l) |
| Registers an association between an attribute and label. | |
| bool | forward (const attribute_type &a, const label_type &l, feature_type &f) const |
| Returns the feature associated with a pair of an attribute and label. | |
| bool | backward (const feature_type &f, attribute_type &a, label_type &l) const |
| Returns the attribute and label associated with a feature. | |
Protected Types | |
|
typedef quark2_base< attribute_type, label_type > | feature_generator_type |
| Class for associations from (attribute, label) to feature. | |
Protected Attributes | |
| size_t | m_num_labels |
| The total number of labels. | |
| size_t | m_num_attributes |
| The total number of attributes. | |
| feature_generator_type | m_features |
| Associations between (attribute, label) and features. | |
| const char* classias::sparse_feature_generator_base< attribute_tmpl, label_tmpl, feature_tmpl >::name | ( | ) | const [inline] |
Returns the name of the feature generator.
| size_t classias::sparse_feature_generator_base< attribute_tmpl, label_tmpl, feature_tmpl >::num_labels | ( | ) | const [inline] |
Returns the total number of labels.
| size_t classias::sparse_feature_generator_base< attribute_tmpl, label_tmpl, feature_tmpl >::num_features | ( | ) | const [inline] |
Returns the total number of features.
| void classias::sparse_feature_generator_base< attribute_tmpl, label_tmpl, feature_tmpl >::set_num_attributes | ( | size_t | num_attributes | ) | [inline] |
Sets the total number of attributes.
| num_attributes | The total number of attributes. |
| void classias::sparse_feature_generator_base< attribute_tmpl, label_tmpl, feature_tmpl >::set_num_labels | ( | size_t | num_labels | ) | [inline] |
Sets the total number of labels.
| num_labels | The total number of labels. |
| bool classias::sparse_feature_generator_base< attribute_tmpl, label_tmpl, feature_tmpl >::needs_registration | ( | ) | const [inline] |
Returns if this class requires registration.
true. | feature_type classias::sparse_feature_generator_base< attribute_tmpl, label_tmpl, feature_tmpl >::regist | ( | const attribute_type & | a, | |
| const label_type & | l | |||
| ) | [inline] |
Registers an association between an attribute and label.
| a | The attribute. | |
| l | The label. |
| bool classias::sparse_feature_generator_base< attribute_tmpl, label_tmpl, feature_tmpl >::forward | ( | const attribute_type & | a, | |
| const label_type & | l, | |||
| feature_type & | f | |||
| ) | const [inline] |
Returns the feature associated with a pair of an attribute and label.
| a | The attribute. | |
| l | The label. | |
| f | The feature for the attribute and label. |
true if the pair of the attribute and label is successfully mapped to a feature, which is always true. | bool classias::sparse_feature_generator_base< attribute_tmpl, label_tmpl, feature_tmpl >::backward | ( | const feature_type & | f, | |
| attribute_type & | a, | |||
| label_type & | l | |||
| ) | const [inline] |
Returns the attribute and label associated with a feature.
| f | The feature. | |
| a | The attribute associated with the feature. | |
| l | The label associated with the feature. |
if the feature is successfully associated with the attribute and label.