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CVwParser Class Reference

Detailed Description

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.

Definition at line 48 of file VwParser.h.

Inheritance diagram for CVwParser:
Inheritance graph
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Public Member Functions

 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 ()
 
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 ()
 
template<>
void set_generic ()
 
void unset_generic ()
 
virtual void print_serializable (const char *prefix="")
 
virtual bool save_serializable (CSerializableFile *file, const char *prefix="")
 
virtual bool load_serializable (CSerializableFile *file, const char *prefix="")
 
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 void update_parameter_hash ()
 
virtual bool parameter_hash_changed ()
 
virtual bool equals (CSGObject *other, float64_t accuracy=0.0, bool tolerant=false)
 
virtual CSGObject * clone ()
 

Public Attributes

hash_func_t hasher
 Hash function to use, of type hash_func_t. More...
 
SGIO * io
 
Parallel * parallel
 
Version * version
 
Parameter * m_parameters
 
Parameter * m_model_selection_parameters
 
Parameter * m_gradient_parameters
 
uint32_t m_hash
 

Protected Member Functions

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 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 Attributes

CVwEnvironment * env
 Environment of VW - used by parser. More...
 
CVwCacheWriter * cache_writer
 Object which will be used for writing cache. More...
 
EVwCacheType cache_type
 Type of cache. More...
 
bool write_cache
 Whether to write cache or not. More...
 

Constructor & Destructor Documentation

CVwParser ( )

Default constructor

Definition at line 21 of file VwParser.cpp.

CVwParser ( CVwEnvironment *  env_to_use)

Constructor taking environment as parameter.

Parameters
env_to_useCVwEnvironment to use

Definition at line 30 of file VwParser.cpp.

~CVwParser ( )
virtual

Destructor

Definition at line 42 of file VwParser.cpp.

Member Function Documentation

void build_gradient_parameter_dictionary ( CMap< TParameter *, CSGObject * > *  dict)
inherited

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.

Parameters
dictdictionary of parameters to be built.

Definition at line 597 of file SGObject.cpp.

CSGObject * clone ( )
virtualinherited

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.

Returns
an identical copy of the given object, which is disjoint in memory. NULL if the clone fails. Note that the returned object is SG_REF'ed

Definition at line 714 of file SGObject.cpp.

CSGObject * deep_copy ( ) const
virtualinherited

A deep copy. All the instance variables will also be copied.

Definition at line 198 of file SGObject.cpp.

bool equals ( CSGObject *  other,
float64_t  accuracy = 0.0,
bool  tolerant = false 
)
virtualinherited

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.

Parameters
otherobject to compare with
accuracyaccuracy to use for comparison (optional)
tolerantallows linient check on float equality (within accuracy)
Returns
true if all parameters were equal, false if not

Definition at line 618 of file SGObject.cpp.

void feature_value ( substring &  s,
v_array< substring > &  name,
float32_t &  v 
)
protected

Get value of feature from a given substring. A default of 1 is assumed if no explicit value is specified.

Parameters
ssubstring, usually a feature:value string
namereturned array of substrings, split into name and value
vvalue of feature, set by reference

Definition at line 271 of file VwParser.cpp.

EVwCacheType get_cache_type ( )

Return the type of cache

Returns
cache type as EVwCacheType

Definition at line 106 of file VwParser.h.

CVwEnvironment* get_env ( )

Get the environment

Returns
environment as CVwEnvironment*

Definition at line 73 of file VwParser.h.

SGIO * get_global_io ( )
inherited

get the io object

Returns
io object

Definition at line 235 of file SGObject.cpp.

Parallel * get_global_parallel ( )
inherited

get the parallel object

Returns
parallel object

Definition at line 277 of file SGObject.cpp.

Version * get_global_version ( )
inherited

get the version object

Returns
version object

Definition at line 290 of file SGObject.cpp.

SGStringList< char > get_modelsel_names ( )
inherited
Returns
vector of names of all parameters which are registered for model selection

Definition at line 498 of file SGObject.cpp.

char * get_modsel_param_descr ( const char *  param_name)
inherited

Returns description of a given parameter string, if it exists. SG_ERROR otherwise

Parameters
param_namename of the parameter
Returns
description of the parameter

Definition at line 522 of file SGObject.cpp.

index_t get_modsel_param_index ( const char *  param_name)
inherited

Returns index of model selection parameter with provided index

Parameters
param_namename of model selection parameter
Returns
index of model selection parameter with provided name, -1 if there is no such

Definition at line 535 of file SGObject.cpp.

virtual const char* get_name ( ) const
virtual

Return the name of the object

Returns
VwParser

Implements CSGObject.

Definition at line 202 of file VwParser.h.

bool get_write_cache ( )

Return whether cache will be written or not

Returns
will cache be written?

Definition at line 131 of file VwParser.h.

void init_cache ( char *  fname,
EVwCacheType  type = C_NATIVE 
)
protected

Initialize the cache writer

Parameters
fnamecache file name
typecache type as EVwCacheType, default is C_NATIVE

Definition at line 248 of file VwParser.cpp.

bool is_generic ( EPrimitiveType *  generic) const
virtualinherited

If the SGSerializable is a class template then TRUE will be returned and GENERIC is set to the type of the generic.

Parameters
genericset to the type of the generic if returning TRUE
Returns
TRUE if a class template.

Definition at line 296 of file SGObject.cpp.

bool load_serializable ( CSerializableFile *  file,
const char *  prefix = "" 
)
virtualinherited

Load this object from file. If it will fail (returning FALSE) then this object will contain inconsistent data and should not be used!

Parameters
filewhere to load from
prefixprefix for members
Returns
TRUE if done, otherwise FALSE

Definition at line 369 of file SGObject.cpp.

void load_serializable_post ( )
throw (ShogunException
)
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.

Exceptions
ShogunExceptionwill be thrown if an error occurs.

Reimplemented in CKernel, CWeightedDegreePositionStringKernel, CList, CAlphabet, CLinearHMM, CGaussianKernel, CInverseMultiQuadricKernel, CCircularKernel, and CExponentialKernel.

Definition at line 426 of file SGObject.cpp.

void load_serializable_pre ( )
throw (ShogunException
)
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.

Exceptions
ShogunExceptionwill be thrown if an error occurs.

Reimplemented in CDynamicArray< T >, CDynamicArray< float64_t >, CDynamicArray< float32_t >, CDynamicArray< int32_t >, CDynamicArray< char >, CDynamicArray< bool >, and CDynamicObjectArray.

Definition at line 421 of file SGObject.cpp.

void noop_mm ( float64_t  label)

A dummy function performing no operation in case training is not to be performed.

Parameters
labellabel

Definition at line 154 of file VwParser.h.

bool parameter_hash_changed ( )
virtualinherited
Returns
whether parameter combination has changed since last update

Definition at line 262 of file SGObject.cpp.

void print_modsel_params ( )
inherited

prints all parameter registered for model selection and their type

Definition at line 474 of file SGObject.cpp.

void print_serializable ( const char *  prefix = "")
virtualinherited

prints registered parameters out

Parameters
prefixprefix for members

Definition at line 308 of file SGObject.cpp.

int32_t read_dense_features ( CIOBuffer *  buf,
VwExample *&  ae 
)

Read an example from a file with dense vectors

Parameters
bufIOBuffer which contains input
aeparsed example
Returns
number of characters read for this example

Definition at line 206 of file VwParser.cpp.

int32_t read_features ( CIOBuffer *  buf,
VwExample *&  ex 
)

Reads input from the buffer and parses it into a VwExample

Parameters
bufIOBuffer which contains input
exparsed example
Returns
number of characters read for this example

Definition at line 48 of file VwParser.cpp.

int32_t read_svmlight_features ( CIOBuffer *  buf,
VwExample *&  ae 
)

Read an example from an SVMLight file

Parameters
bufIOBuffer which contains input
aeparsed example
Returns
number of characters read for this example

Definition at line 164 of file VwParser.cpp.

char* safe_index ( char *  start,
char  v,
char *  max 
)
protected

Get the index of a character in a memory location taking care not to go beyond the max pointer.

Parameters
startstart memory location, char*
vcharacter to search for
maxlast location to look in
Returns
index of found location as char*

Definition at line 243 of file VwParser.h.

bool save_serializable ( CSerializableFile *  file,
const char *  prefix = "" 
)
virtualinherited

Save this object to file.

Parameters
filewhere to save the object; will be closed during returning if PREFIX is an empty string.
prefixprefix for members
Returns
TRUE if done, otherwise FALSE

Definition at line 314 of file SGObject.cpp.

void save_serializable_post ( )
throw (ShogunException
)
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::SAVE_SERIALIZABLE_POST is called.

Exceptions
ShogunExceptionwill be thrown if an error occurs.

Reimplemented in CKernel.

Definition at line 436 of file SGObject.cpp.

void save_serializable_pre ( )
throw (ShogunException
)
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::SAVE_SERIALIZABLE_PRE is called.

Exceptions
ShogunExceptionwill be thrown if an error occurs.

Reimplemented in CKernel, CDynamicArray< T >, CDynamicArray< float64_t >, CDynamicArray< float32_t >, CDynamicArray< int32_t >, CDynamicArray< char >, CDynamicArray< bool >, and CDynamicObjectArray.

Definition at line 431 of file SGObject.cpp.

void set_cache_parameters ( char *  fname,
EVwCacheType  type = C_NATIVE 
)

Set the cache parameters

Parameters
fnamename of the cache file
typetype of cache as one in EVwCacheType

Definition at line 96 of file VwParser.h.

void set_env ( CVwEnvironment *  env_to_use)

Set the environment

Parameters
env_to_useenvironment as CVwEnvironment*

Definition at line 84 of file VwParser.h.

void set_generic ( )
inherited

Definition at line 41 of file SGObject.cpp.

void set_generic ( )
inherited

Definition at line 46 of file SGObject.cpp.

void set_generic ( )
inherited

Definition at line 51 of file SGObject.cpp.

void set_generic ( )
inherited

Definition at line 56 of file SGObject.cpp.

void set_generic ( )
inherited

Definition at line 61 of file SGObject.cpp.

void set_generic ( )
inherited

Definition at line 66 of file SGObject.cpp.

void set_generic ( )
inherited

Definition at line 71 of file SGObject.cpp.

void set_generic ( )
inherited

Definition at line 76 of file SGObject.cpp.

void set_generic ( )
inherited

Definition at line 81 of file SGObject.cpp.

void set_generic ( )
inherited

Definition at line 86 of file SGObject.cpp.

void set_generic ( )
inherited

Definition at line 91 of file SGObject.cpp.

void set_generic ( )
inherited

Definition at line 96 of file SGObject.cpp.

void set_generic ( )
inherited

Definition at line 101 of file SGObject.cpp.

void set_generic ( )
inherited

Definition at line 106 of file SGObject.cpp.

void set_generic ( )
inherited

Definition at line 111 of file SGObject.cpp.

void set_generic ( )
inherited

set generic type to T

void set_global_io ( SGIO *  io)
inherited

set the io object

Parameters
ioio object to use

Definition at line 228 of file SGObject.cpp.

void set_global_parallel ( Parallel *  parallel)
inherited

set the parallel object

Parameters
parallelparallel object to use

Definition at line 241 of file SGObject.cpp.

void set_global_version ( Version *  version)
inherited

set the version object

Parameters
versionversion object to use

Definition at line 283 of file SGObject.cpp.

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.

Parameters
labellabel based on which to update

Definition at line 162 of file VwParser.h.

void set_mm ( float64_t  label)

Update min and max labels seen in the environment

Parameters
labelcurrent label based on which to update

Definition at line 141 of file VwParser.h.

void set_write_cache ( bool  wr_cache)

Set whether to write cache file or not

Parameters
wr_cachewrite cache or not

Definition at line 116 of file VwParser.h.

CSGObject * shallow_copy ( ) const
virtualinherited

A shallow copy. All the SGObject instance variables will be simply assigned and SG_REF-ed.

Reimplemented in CGaussianKernel.

Definition at line 192 of file SGObject.cpp.

void tokenize ( char  delim,
substring  s,
v_array< substring > &  ret 
)
protected

Split a given substring into an array of substrings based on a specified delimiter

Parameters
delimdelimiter to use
ssubstring to tokenize
retarray of substrings, returned

Definition at line 295 of file VwParser.cpp.

void unset_generic ( )
inherited

unset generic type

this has to be called in classes specializing a template class

Definition at line 303 of file SGObject.cpp.

void update_parameter_hash ( )
virtualinherited

Updates the hash of current parameter combination

Definition at line 248 of file SGObject.cpp.

Member Data Documentation

EVwCacheType cache_type
protected

Type of cache.

Definition at line 260 of file VwParser.h.

CVwCacheWriter* cache_writer
protected

Object which will be used for writing cache.

Definition at line 258 of file VwParser.h.

CVwEnvironment* env
protected

Environment of VW - used by parser.

Definition at line 256 of file VwParser.h.

hash_func_t hasher

Hash function to use, of type hash_func_t.

Definition at line 252 of file VwParser.h.

SGIO* io
inherited

io

Definition at line 369 of file SGObject.h.

Parameter* m_gradient_parameters
inherited

parameters wrt which we can compute gradients

Definition at line 384 of file SGObject.h.

uint32_t m_hash
inherited

Hash of parameter values

Definition at line 387 of file SGObject.h.

Parameter* m_model_selection_parameters
inherited

model selection parameters

Definition at line 381 of file SGObject.h.

Parameter* m_parameters
inherited

parameters

Definition at line 378 of file SGObject.h.

Parallel* parallel
inherited

parallel

Definition at line 372 of file SGObject.h.

Version* version
inherited

version

Definition at line 375 of file SGObject.h.

bool write_cache
protected

Whether to write cache or not.

Definition at line 262 of file VwParser.h.

The documentation for this class was generated from the following files:
SHOGUN Machine Learning Toolbox - Documentation