CVwParser is the object which provides the functions to parse examples from buffered input.
An instance of this class can be created in CStreamingVwFile and the appropriate read_*_features function called to parse examples from different formats.
It also encapsulates a CVwCacheWriter object which may be used in case a cache file is to be generated simultaneously with parsing.
在文件 VwParser.h 第 46 行定义.
Public 成员函数 | |
CVwParser () | |
CVwParser (CVwEnvironment *env_to_use) | |
virtual | ~CVwParser () |
CVwEnvironment * | get_env () |
void | set_env (CVwEnvironment *env_to_use) |
void | set_cache_parameters (char *fname, EVwCacheType type=C_NATIVE) |
EVwCacheType | get_cache_type () |
void | set_write_cache (bool wr_cache) |
bool | get_write_cache () |
void | set_mm (float64_t label) |
void | noop_mm (float64_t label) |
void | set_minmax (float64_t label) |
int32_t | read_features (CIOBuffer *buf, VwExample *&ex) |
int32_t | read_svmlight_features (CIOBuffer *buf, VwExample *&ae) |
int32_t | read_dense_features (CIOBuffer *buf, VwExample *&ae) |
virtual const char * | get_name () const |
virtual CSGObject * | shallow_copy () const |
virtual CSGObject * | deep_copy () const |
virtual bool | is_generic (EPrimitiveType *generic) const |
template<class T > | |
void | set_generic () |
template<> | |
void | set_generic () |
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void | set_generic () |
template<> | |
void | set_generic () |
template<> | |
void | set_generic () |
template<> | |
void | set_generic () |
template<> | |
void | set_generic () |
template<> | |
void | set_generic () |
template<> | |
void | set_generic () |
template<> | |
void | set_generic () |
template<> | |
void | set_generic () |
template<> | |
void | set_generic () |
template<> | |
void | set_generic () |
template<> | |
void | set_generic () |
template<> | |
void | set_generic () |
template<> | |
void | set_generic () |
void | unset_generic () |
virtual void | print_serializable (const char *prefix="") |
virtual bool | save_serializable (CSerializableFile *file, const char *prefix="", int32_t param_version=Version::get_version_parameter()) |
virtual bool | load_serializable (CSerializableFile *file, const char *prefix="", int32_t param_version=Version::get_version_parameter()) |
DynArray< TParameter * > * | load_file_parameters (const SGParamInfo *param_info, int32_t file_version, CSerializableFile *file, const char *prefix="") |
DynArray< TParameter * > * | load_all_file_parameters (int32_t file_version, int32_t current_version, CSerializableFile *file, const char *prefix="") |
void | map_parameters (DynArray< TParameter * > *param_base, int32_t &base_version, DynArray< const SGParamInfo * > *target_param_infos) |
void | set_global_io (SGIO *io) |
SGIO * | get_global_io () |
void | set_global_parallel (Parallel *parallel) |
Parallel * | get_global_parallel () |
void | set_global_version (Version *version) |
Version * | get_global_version () |
SGStringList< char > | get_modelsel_names () |
void | print_modsel_params () |
char * | get_modsel_param_descr (const char *param_name) |
index_t | get_modsel_param_index (const char *param_name) |
void | build_gradient_parameter_dictionary (CMap< TParameter *, CSGObject * > *dict) |
virtual bool | update_parameter_hash () |
virtual bool | equals (CSGObject *other, float64_t accuracy=0.0) |
virtual CSGObject * | clone () |
Public 属性 | |
hash_func_t | hasher |
Hash function to use, of type hash_func_t. 更多... | |
SGIO * | io |
Parallel * | parallel |
Version * | version |
Parameter * | m_parameters |
Parameter * | m_model_selection_parameters |
Parameter * | m_gradient_parameters |
ParameterMap * | m_parameter_map |
uint32_t | m_hash |
Protected 成员函数 | |
void | init_cache (char *fname, EVwCacheType type=C_NATIVE) |
void | feature_value (substring &s, v_array< substring > &name, float32_t &v) |
void | tokenize (char delim, substring s, v_array< substring > &ret) |
char * | safe_index (char *start, char v, char *max) |
virtual TParameter * | migrate (DynArray< TParameter * > *param_base, const SGParamInfo *target) |
virtual void | one_to_one_migration_prepare (DynArray< TParameter * > *param_base, const SGParamInfo *target, TParameter *&replacement, TParameter *&to_migrate, char *old_name=NULL) |
virtual void | load_serializable_pre () throw (ShogunException) |
virtual void | load_serializable_post () throw (ShogunException) |
virtual void | save_serializable_pre () throw (ShogunException) |
virtual void | save_serializable_post () throw (ShogunException) |
Protected 属性 | |
CVwEnvironment * | env |
Environment of VW - used by parser. 更多... | |
CVwCacheWriter * | cache_writer |
Object which will be used for writing cache. 更多... | |
EVwCacheType | cache_type |
Type of cache. 更多... | |
bool | write_cache |
Whether to write cache or not. 更多... | |
CVwParser | ( | ) |
Default constructor
在文件 VwParser.cpp 第 21 行定义.
CVwParser | ( | CVwEnvironment * | env_to_use | ) |
Constructor taking environment as parameter.
env_to_use | CVwEnvironment to use |
在文件 VwParser.cpp 第 30 行定义.
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Destructor
在文件 VwParser.cpp 第 42 行定义.
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Builds a dictionary of all parameters in SGObject as well of those of SGObjects that are parameters of this object. Dictionary maps parameters to the objects that own them.
dict | dictionary of parameters to be built. |
在文件 SGObject.cpp 第 1195 行定义.
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Creates a clone of the current object. This is done via recursively traversing all parameters, which corresponds to a deep copy. Calling equals on the cloned object always returns true although none of the memory of both objects overlaps.
在文件 SGObject.cpp 第 1312 行定义.
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A deep copy. All the instance variables will also be copied.
在文件 SGObject.h 第 159 行定义.
Recursively compares the current SGObject to another one. Compares all registered numerical parameters, recursion upon complex (SGObject) parameters. Does not compare pointers!
May be overwritten but please do with care! Should not be necessary in most cases.
other | object to compare with |
accuracy | accuracy to use for comparison (optional) |
在文件 SGObject.cpp 第 1216 行定义.
Get value of feature from a given substring. A default of 1 is assumed if no explicit value is specified.
s | substring, usually a feature:value string |
name | returned array of substrings, split into name and value |
v | value of feature, set by reference |
在文件 VwParser.cpp 第 271 行定义.
EVwCacheType get_cache_type | ( | ) |
CVwEnvironment* get_env | ( | ) |
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在文件 SGObject.cpp 第 1099 行定义.
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Returns description of a given parameter string, if it exists. SG_ERROR otherwise
param_name | name of the parameter |
在文件 SGObject.cpp 第 1123 行定义.
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Returns index of model selection parameter with provided index
param_name | name of model selection parameter |
在文件 SGObject.cpp 第 1136 行定义.
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bool get_write_cache | ( | ) |
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Initialize the cache writer
fname | cache file name |
type | cache type as EVwCacheType, default is C_NATIVE |
在文件 VwParser.cpp 第 248 行定义.
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If the SGSerializable is a class template then TRUE will be returned and GENERIC is set to the type of the generic.
generic | set to the type of the generic if returning TRUE |
在文件 SGObject.cpp 第 267 行定义.
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maps all parameters of this instance to the provided file version and loads all parameter data from the file into an array, which is sorted (basically calls load_file_parameter(...) for all parameters and puts all results into a sorted array)
file_version | parameter version of the file |
current_version | version from which mapping begins (you want to use Version::get_version_parameter() for this in most cases) |
file | file to load from |
prefix | prefix for members |
在文件 SGObject.cpp 第 672 行定义.
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loads some specified parameters from a file with a specified version The provided parameter info has a version which is recursively mapped until the file parameter version is reached. Note that there may be possibly multiple parameters in the mapping, therefore, a set of TParameter instances is returned
param_info | information of parameter |
file_version | parameter version of the file, must be <= provided parameter version |
file | file to load from |
prefix | prefix for members |
在文件 SGObject.cpp 第 513 行定义.
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Load this object from file. If it will fail (returning FALSE) then this object will contain inconsistent data and should not be used!
file | where to load from |
prefix | prefix for members |
param_version | (optional) a parameter version different to (this is mainly for testing, better do not use) |
在文件 SGObject.cpp 第 344 行定义.
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protectedvirtualinherited |
Can (optionally) be overridden to post-initialize some member variables which are not PARAMETER::ADD'ed. Make sure that at first the overridden method BASE_CLASS::LOAD_SERIALIZABLE_POST is called.
ShogunException | Will be thrown if an error occurres. |
被 CWeightedDegreePositionStringKernel, CKernel, CList, CAlphabet, CLinearHMM, CGaussianKernel, CInverseMultiQuadricKernel, CCircularKernel , 以及 CExponentialKernel 重载.
在文件 SGObject.cpp 第 1028 行定义.
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protectedvirtualinherited |
Can (optionally) be overridden to pre-initialize some member variables which are not PARAMETER::ADD'ed. Make sure that at first the overridden method BASE_CLASS::LOAD_SERIALIZABLE_PRE is called.
ShogunException | Will be thrown if an error occurres. |
被 CDynamicArray< T >, CDynamicArray< float64_t >, CDynamicArray< float32_t >, CDynamicArray< int32_t >, CDynamicArray< char >, CDynamicArray< bool > , 以及 CDynamicObjectArray 重载.
在文件 SGObject.cpp 第 1023 行定义.
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Takes a set of TParameter instances (base) with a certain version and a set of target parameter infos and recursively maps the base level wise to the current version using CSGObject::migrate(...). The base is replaced. After this call, the base version containing parameters should be of same version/type as the initial target parameter infos. Note for this to work, the migrate methods and all the internal parameter mappings have to match
param_base | set of TParameter instances that are mapped to the provided target parameter infos |
base_version | version of the parameter base |
target_param_infos | set of SGParamInfo instances that specify the target parameter base |
在文件 SGObject.cpp 第 710 行定义.
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protectedvirtualinherited |
creates a new TParameter instance, which contains migrated data from the version that is provided. The provided parameter data base is used for migration, this base is a collection of all parameter data of the previous version. Migration is done FROM the data in param_base TO the provided param info Migration is always one version step. Method has to be implemented in subclasses, if no match is found, base method has to be called.
If there is an element in the param_base which equals the target, a copy of the element is returned. This represents the case when nothing has changed and therefore, the migrate method is not overloaded in a subclass
param_base | set of TParameter instances to use for migration |
target | parameter info for the resulting TParameter |
在文件 SGObject.cpp 第 917 行定义.
void noop_mm | ( | float64_t | label | ) |
A dummy function performing no operation in case training is not to be performed.
label | label |
在文件 VwParser.h 第 152 行定义.
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This method prepares everything for a one-to-one parameter migration. One to one here means that only ONE element of the parameter base is needed for the migration (the one with the same name as the target). Data is allocated for the target (in the type as provided in the target SGParamInfo), and a corresponding new TParameter instance is written to replacement. The to_migrate pointer points to the single needed TParameter instance needed for migration. If a name change happened, the old name may be specified by old_name. In addition, the m_delete_data flag of to_migrate is set to true. So if you want to migrate data, the only thing to do after this call is converting the data in the m_parameter fields. If unsure how to use - have a look into an example for this. (base_migration_type_conversion.cpp for example)
param_base | set of TParameter instances to use for migration |
target | parameter info for the resulting TParameter |
replacement | (used as output) here the TParameter instance which is returned by migration is created into |
to_migrate | the only source that is used for migration |
old_name | with this parameter, a name change may be specified |
在文件 SGObject.cpp 第 857 行定义.
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prints all parameter registered for model selection and their type
在文件 SGObject.cpp 第 1075 行定义.
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Read an example from a file with dense vectors
buf | IOBuffer which contains input |
ae | parsed example |
在文件 VwParser.cpp 第 206 行定义.
Reads input from the buffer and parses it into a VwExample
buf | IOBuffer which contains input |
ex | parsed example |
在文件 VwParser.cpp 第 48 行定义.
Read an example from an SVMLight file
buf | IOBuffer which contains input |
ae | parsed example |
在文件 VwParser.cpp 第 164 行定义.
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Get the index of a character in a memory location taking care not to go beyond the max pointer.
start | start memory location, char* |
v | character to search for |
max | last location to look in |
在文件 VwParser.h 第 241 行定义.
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Save this object to file.
file | where to save the object; will be closed during returning if PREFIX is an empty string. |
prefix | prefix for members |
param_version | (optional) a parameter version different to (this is mainly for testing, better do not use) |
在文件 SGObject.cpp 第 285 行定义.
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Can (optionally) be overridden to post-initialize some member variables which are not PARAMETER::ADD'ed. Make sure that at first the overridden method BASE_CLASS::SAVE_SERIALIZABLE_POST is called.
ShogunException | Will be thrown if an error occurres. |
被 CKernel 重载.
在文件 SGObject.cpp 第 1038 行定义.
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Can (optionally) be overridden to pre-initialize some member variables which are not PARAMETER::ADD'ed. Make sure that at first the overridden method BASE_CLASS::SAVE_SERIALIZABLE_PRE is called.
ShogunException | Will be thrown if an error occurres. |
被 CKernel, CDynamicArray< T >, CDynamicArray< float64_t >, CDynamicArray< float32_t >, CDynamicArray< int32_t >, CDynamicArray< char >, CDynamicArray< bool > , 以及 CDynamicObjectArray 重载.
在文件 SGObject.cpp 第 1033 行定义.
void set_cache_parameters | ( | char * | fname, |
EVwCacheType | type = C_NATIVE |
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Set the cache parameters
fname | name of the cache file |
type | type of cache as one in EVwCacheType |
在文件 VwParser.h 第 94 行定义.
void set_env | ( | CVwEnvironment * | env_to_use | ) |
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在文件 SGObject.cpp 第 40 行定义.
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在文件 SGObject.cpp 第 45 行定义.
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在文件 SGObject.cpp 第 50 行定义.
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在文件 SGObject.cpp 第 55 行定义.
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在文件 SGObject.cpp 第 60 行定义.
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在文件 SGObject.cpp 第 65 行定义.
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在文件 SGObject.cpp 第 70 行定义.
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在文件 SGObject.cpp 第 75 行定义.
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在文件 SGObject.cpp 第 80 行定义.
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在文件 SGObject.cpp 第 85 行定义.
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在文件 SGObject.cpp 第 90 行定义.
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在文件 SGObject.cpp 第 95 行定义.
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在文件 SGObject.cpp 第 100 行定义.
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在文件 SGObject.cpp 第 105 行定义.
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在文件 SGObject.cpp 第 110 行定义.
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set generic type to T
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void set_minmax | ( | float64_t | label | ) |
Function which is actually called to update min and max labels Should be set to one of the functions implemented for this.
label | label based on which to update |
在文件 VwParser.h 第 160 行定义.
void set_mm | ( | float64_t | label | ) |
Update min and max labels seen in the environment
label | current label based on which to update |
在文件 VwParser.h 第 139 行定义.
void set_write_cache | ( | bool | wr_cache | ) |
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A shallow copy. All the SGObject instance variables will be simply assigned and SG_REF-ed.
被 CGaussianKernel 重载.
在文件 SGObject.h 第 150 行定义.
Split a given substring into an array of substrings based on a specified delimiter
delim | delimiter to use |
s | substring to tokenize |
ret | array of substrings, returned |
在文件 VwParser.cpp 第 295 行定义.
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unset generic type
this has to be called in classes specializing a template class
在文件 SGObject.cpp 第 274 行定义.
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Updates the hash of current parameter combination.
在文件 SGObject.cpp 第 226 行定义.
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Type of cache.
在文件 VwParser.h 第 258 行定义.
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Object which will be used for writing cache.
在文件 VwParser.h 第 256 行定义.
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Environment of VW - used by parser.
在文件 VwParser.h 第 254 行定义.
hash_func_t hasher |
Hash function to use, of type hash_func_t.
在文件 VwParser.h 第 250 行定义.
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io
在文件 SGObject.h 第 513 行定义.
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parameters wrt which we can compute gradients
在文件 SGObject.h 第 528 行定义.
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Hash of parameter values
在文件 SGObject.h 第 534 行定义.
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model selection parameters
在文件 SGObject.h 第 525 行定义.
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map for different parameter versions
在文件 SGObject.h 第 531 行定义.
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parameters
在文件 SGObject.h 第 522 行定义.
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parallel
在文件 SGObject.h 第 516 行定义.
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version
在文件 SGObject.h 第 519 行定义.
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Whether to write cache or not.
在文件 VwParser.h 第 260 行定义.