Python API

This is the Bob database entry for the Labeled Faces in the Wild (LFW) database.

bob.db.lfw.get_config()

Returns a string containing the configuration information.

class bob.db.lfw.Annotation(file_id, annotation_type, annotations)

Bases: sqlalchemy.ext.declarative.api.Base

annotation_type

annotation_type_choices = ('funneled', 'idiap')

annotations

file_id

id

metadata = MetaData(bind=None)

class bob.db.lfw.Client(name)

Bases: sqlalchemy.ext.declarative.api.Base

Information about the clients (identities) of the LFW database.

id

metadata = MetaData(bind=None)

class bob.db.lfw.Database(original_directory=None, original_extension='.jpg', annotation_type=None)

Bases: bob.db.verification.utils.database.SQLiteDatabase

The dataset class opens and maintains a connection opened to the Database.

It provides many different ways to probe for the characteristics of the data and for the data itself inside the database.

all_files(**kwargs)

Returns the list of all File objects that satisfy your query. For possible keyword arguments, please check the implementation of the derived class Database.objects() function.

annotation_types()

Queries the database for the available types of annotations.

annotations(file, annotation_type=None)

Returns the annotations for the given file id as a dictionary, e.g. {‘reye’:(y,x), ‘leye’:(y,x)}.

Keyword parameters:

file_id

The File object for which you want to retrieve the annotations

annotation_type

The type of annotations (‘idiap’, ‘funneled’). If not specified, and if not given in the constructor, all annotations are taken, which might to cause an assertion error.

assert_validity()

Raise a RuntimeError if the database back-end is not available.

check_parameter_for_validity(parameter, parameter_description, valid_parameters, default_parameter=None)

Checks the given parameter for validity, i.e., if it is contained in the set of valid parameters. If the parameter is ‘None’ or empty, the default_parameter will be returned, in case it is specified, otherwise a ValueError will be raised.

This function will return the parameter after the check tuple or list of parameters, or raise a ValueError.

Keyword parameters:

parameter : str

The single parameter to be checked. Might be a string or None.

parameter_description : str

A short description of the parameter. This will be used to raise an exception in case the parameter is not valid.

valid_parameters : [str]

A list/tuple of valid values for the parameters.

default_parameters : [str] or None

The default parameter that will be returned in case parameter is None or empty. If omitted and parameter is empty, a ValueError is raised.

check_parameters_for_validity(parameters, parameter_description, valid_parameters, default_parameters=None)

Checks the given parameters for validity, i.e., if they are contained in the set of valid parameters. It also assures that the parameters form a tuple or a list. If parameters is ‘None’ or empty, the default_parameters will be returned (if default_parameters is omitted, all valid_parameters are returned).

This function will return a tuple or list of parameters, or raise a ValueError.

Keyword parameters:

parameters : str, [str] or None

The parameters to be checked. Might be a string, a list/tuple of strings, or None.

parameter_description : str

A short description of the parameter. This will be used to raise an exception in case the parameter is not valid.

valid_parameters : [str]

A list/tuple of valid values for the parameters.

default_parameters : [str] or None

The list/tuple of default parameters that will be returned in case parameters is None or empty. If omitted, all valid_parameters are used.

clients(protocol=None, groups=None, subworld='sevenfolds', world_type='unrestricted')

Returns a list of Client objects for the specific query by the user.

Keyword Parameters:

protocol

The protocol to consider; one of: (‘view1’, ‘fold1’, ..., ‘fold10’), or None

groups

The groups to which the clients belong; one or several of: (‘world’, ‘dev’, ‘eval’) Note: the ‘eval’ group does not exist for protocol ‘view1’.

subworld

The subset of the training data. Has to be specified if groups includes ‘world’ and protocol is one of ‘fold1’, ..., ‘fold10’. It might be exactly one of (‘onefolds’, ‘twofolds’, ..., ‘sevenfolds’). Ignored for group ‘dev’ and ‘eval’.

world_type

One of (‘restricted’, ‘unrestricted’). If ‘restricted’ (the default), only the clients that are used in one of the training pairs are returned. For ‘unrestricted’, all training people are returned. Ignored for group ‘dev’ and ‘eval’.

Returns: A list containing all Client objects which have the desired properties.

enroll_files(protocol=None, model_id=None, groups='dev', **kwargs)

Returns the list of enrollment File objects from the given model id of the given protocol for the given groups that satisfy your query. If the model_id is None (the default), enrollment files for all models are returned. For possible keyword arguments, please check the implementation of the derived class Database.objects() function.

file_names(files, directory, extension)

This function returns the list of original file names for the given list of File objects.

Keyword parameters:

files : [File]

The list of File objects for which the file names should be retrieved

directory : str

The base directory where the files are stored

extension : str

The file name extension of the files

Return value : [str]

The file names for the given File objects, in the same order.

files(ids, preserve_order=True)

Returns a list of File objects with the given file ids

Keyword Parameters:

ids : [various type]

The ids of the object in the database table “file”. This object should be a python iterable (such as a tuple or list).

preserve_order : bool

If True (the default) the order of elements is preserved, but the execution time increases.

Returns a list (that may be empty) of File objects.

get_client_id_from_file_id(file_id, **kwargs)

Returns the client_id (real client id) attached to the given file_id

Keyword Parameters:

file_id

The file_id to consider

Returns: The client_id attached to the given file_id

get_client_id_from_model_id(model_id, **kwargs)

Returns the client_id (real client id) attached to the given model id

Keyword Parameters:

model_id

The model to consider

type

One of (‘restricted’, ‘unrestricted’). If the type ‘restricted’ is given, model_ids will be handled as file ids, if type is ‘unrestricted’, model ids will be client ids.

Returns: The client_id attached to the given model

groups(protocol=None)

Returns the groups, which are available in the database.

is_valid()

Returns if a valid session has been opened for reading the database.

model_ids(protocol=None, groups=None)

Returns a list of model ids for the specific query by the user. For the ‘dev’ and ‘eval’ groups, the first element of each pair is extracted.

Keyword Parameters:

protocol

The protocol to consider; one of: (‘view1’, ‘fold1’, ..., ‘fold10’), or None

groups

The groups to which the clients belong; one or several of: (‘dev’, ‘eval’) The ‘eval’ group does not exist for protocol ‘view1’.

Returns: A list containing all model ids which have the desired properties.

models(protocol=None, groups=None)

Returns a list of File objects (there are multiple models per client) for the specific query by the user. For the ‘dev’ and ‘eval’ groups, the first element of each pair is extracted.

Keyword Parameters:

protocol

The protocol to consider; one of: (‘view1’, ‘fold1’, ..., ‘fold10’), or None

groups

The groups to which the clients belong; one or several of: (‘dev’, ‘eval’) The ‘eval’ group does not exist for protocol ‘view1’.

Returns: A list containing all File objects which have the desired properties.

objects(protocol=None, model_ids=None, groups=None, purposes=None, subworld='sevenfolds', world_type='unrestricted')

Returns a list of File objects for the specific query by the user.

Keyword Parameters:

protocol

The protocol to consider (‘view1’, ‘fold1’, ..., ‘fold10’), or None

groups

The groups to which the objects belong (‘world’, ‘dev’, ‘eval’)

purposes

The purposes of the objects (‘enroll’, ‘probe’)

subworld

The subset of the training data. Has to be specified if groups includes ‘world’ and protocol is one of ‘fold1’, ..., ‘fold10’. It might be exactly one of (‘onefolds’, ‘twofolds’, ..., ‘sevenfolds’).

world_type

One of (‘restricted’, ‘unrestricted’). If ‘restricted’, only the files that are used in one of the training pairs are used. For ‘unrestricted’, all files of the training people are returned.

model_ids

Only retrieves the objects for the provided list of model ids. If ‘None’ is given (this is the default), no filter over the model_ids is performed. Note that the combination of ‘world’ group and ‘model_ids’ should be avoided.

Returns: A list of File objects considering all the filtering criteria.

original_file_name(file, check_existence=True)

This function returns the original file name for the given File object.

Keyword parameters:

file : File or a derivative

The File objects for which the file name should be retrieved

check_existence : bool

Check if the original file exists?

Return value : str

The original file name for the given File object

original_file_names(files, check_existence=True)

This function returns the list of original file names for the given list of File objects.

Keyword parameters:

files : [File]

The list of File objects for which the file names should be retrieved

check_existence : bool

Check if the original files exists?

Return value : [str]

The original file names for the given File objects, in the same order.

pairs(protocol=None, groups=None, classes=None, subworld='sevenfolds')

Queries a list of Pair’s of files.

Keyword Parameters:

protocol

The protocol to consider (‘view1’, ‘fold1’, ..., ‘fold10’)

groups

The groups to which the objects belong (‘world’, ‘dev’, ‘eval’)

classes

The classes to which the pairs belong (‘matched’, ‘unmatched’), or (‘client’, ‘impostor’)

subworld

The subset of the training data. Has to be specified if groups includes ‘world’ and protocol is one of ‘fold1’, ..., ‘fold10’. It might be exactly one of (‘onefolds’, ‘twofolds’, ..., ‘sevenfolds’).

Returns: A list of Pair’s considering all the filtering criteria.

paths(ids, prefix=None, suffix=None, preserve_order=True)

Returns a full file paths considering particular file ids, a given directory and an extension

Keyword Parameters:

ids : [various type]

The ids of the object in the database table “file”. This object should be a python iterable (such as a tuple or list).

prefix : str or None

The bit of path to be prepended to the filename stem

suffix : str or None

The extension determines the suffix that will be appended to the filename stem.

preserve_order : bool

If True (the default) the order of elements is preserved, but the execution time increases.

Returns a list (that may be empty) of the fully constructed paths given the file ids.

probe_files(protocol=None, model_id=None, groups='dev', **kwargs)

Returns the list of probe File objects to probe the model with the given model id of the given protocol for the given groups that satisfy your query. If the model_id is None (the default), all possible probe files are returned. For possible keyword arguments, please check the implementation of the derived class Database.objects() function.

protocol_names()

Returns the names of the valid protocols.

provides_file_set_for_protocol(protocol=None)

Returns True if the given protocol specifies file sets for probes, instead of a single probe file. In this default implementation, False is returned, throughout. If you need different behavior, please overload this function in your derived class.

query(*args)

Creates a query to the database using the given arguments.

reverse(paths, preserve_order=True)

Reverses the lookup: from certain paths, return a list of File objects

Keyword Parameters:

paths : [str]

The filename stems to query for. This object should be a python iterable (such as a tuple or list)

preserve_order : True

If True (the default) the order of elements is preserved, but the execution time increases.

Returns a list (that may be empty).

subworld_names(protocol=None)

Returns all valid sub-worlds for the fold.. protocols; for view1 an empty list is returned.

test_files(protocol=None, groups='dev', **kwargs)

Returns the list of all test File objects of the given groups that satisfy your query. Test objects are all File objects that serve either for enrollment or probing. For possible keyword arguments, please check the implementation of the derived class Database.objects() function.

training_files(protocol=None, **kwargs)

Returns the list of all training (world) File objects that satisfy your query. For possible keyword arguments, please check the implementation of the derived class Database.objects() function.

uniquify(file_list)

Sorts the given list of File objects and removes duplicates from it.

Keyword parameters:

file_list : [File]

A list of File objects to be handled. Also other objects can be handled, as long as they are sortable.

Returns

A sorted copy of the given list with the duplicated removed.

world_types()

Returns the valid types of worlds: (‘restricted’, ‘unrestricted’).

class bob.db.lfw.File(client_id, shot_id)

Bases: sqlalchemy.ext.declarative.api.Base, bob.db.verification.utils.file.File

Information about the files of the LFW database.

annotations

client

client_id

id

make_path(directory=None, extension=None)

Wraps the current path so that a complete path is formed

Keyword parameters:

directory : str or None

An optional directory name that will be prefixed to the returned result.

extension : str or None

An optional extension that will be suffixed to the returned filename. The extension normally includes the leading . character as in .jpg or .hdf5.

Returns a string containing the newly generated file path.

metadata = MetaData(bind=None)

name

path

save(data, directory=None, extension='.hdf5', create_directories=True)

Saves the input data at the specified location and using the given extension.

Keyword parameters:

data : various types

The data blob to be saved (normally a numpy.ndarray).

directory : str or None

If not empty or None, this directory is prefixed to the final file destination

extension : str or None

The extension of the filename. This extension will control the type of output and the codec for saving the input blob.

create_directories : bool

Should the directory structure be created (if necessary) before writing the data?

shot_id

class bob.db.lfw.Pair(protocol, enroll_file_id, probe_file_id, is_match)

Bases: sqlalchemy.ext.declarative.api.Base

Information of the pairs (as given in the pairs.txt files) of the LFW database.

enroll_file

enroll_file_id

id

is_match

metadata = MetaData(bind=None)

probe_file

probe_file_id

protocol

class bob.db.lfw.People(protocol, file_id)

Bases: sqlalchemy.ext.declarative.api.Base

Information about the people (as given in the people.txt file) of the LFW database.

file_id

id

metadata = MetaData(bind=None)

protocol