def __init__(self, bands, border=2, baseline_interval=None, data_interval=None, Fs=1000.0, *args, **kwargs):
"""Initialize the FrequencyBandPowerMapper
:Parameters:
bands: list of 2-tuples
list of (fl,fh), edge-frequencies for filtering
border: int
order of the filter to be used
baseline_interval: 2-tuple of ints
indices of the interval to be used for baseline correction
data_interval: 2-tuple of ints
indices of the interval to be used for cluster search
args, kwargs:
additional arguments passed to parent class
"""
Mapper.__init__(self,*args,**kwargs)
self._bands = bands
self._border = border
self._baseline_interval = baseline_interval
self._data_interval = data_interval
self._Fs = Fs
#TODO: Perform some checks, for valid intervals etc.
#precalculate filter parameters (butter)
self._bs = list(np.zeros((len(bands))))
self._as = list(np.zeros((len(bands))))
for i_b in range(len(bands)):
[self._bs[i_b],self._as[i_b]]=butter(border,[bands[i_b][0]/(Fs/2),bands[i_b][1]/(Fs/2)], btype="band")
def __init__(self, node, nodeargs=None, inspace=None):
"""
Parameters
----------
node : mdp.Node instance
This node instance is taken as the pristine source of which a
copy is made for actual processing upon each training attempt.
nodeargs : dict
Dictionary for additional arguments for all calls to the MDP
node. The dictionary key's meaning is as follows:
'train'
Arguments for calls to `Node.train()`
'stoptrain'
Arguments for calls to `Node.stop_training()`
'exec'
Arguments for calls to `Node.execute()`
'inv'
Arguments for calls to `Node.inverse()`
The value for each item is always a 2-tuple, consisting of a
tuple (for the arguments), and a dictionary (for keyword
arguments), i.e. ((), {}). Both, tuple and dictionary have to be
provided even if they are empty.
inspace : see base class
"""
# TODO: starting from MDP2.5 this check should become:
# TODO: if node.has_multiple_training_phases():
if not len(node._train_seq) == 1:
raise ValueError("MDPNodeMapper does not support MDP nodes with "
"multiple training phases.")
Mapper.__init__(self, inspace=inspace)
self.__pristine_node = None
self.node = node
self.nodeargs = nodeargs
def __init__(self, num, window=None, chunks_attr=None, position_attr=None,
attr_strategy='remove', inspace=None):
"""
Parameters
----------
num : int
Number of output samples. If operating on chunks, this is the number
of samples per chunk.
window : str or float or tuple
Passed to scipy.signal.resample
chunks_attr : str or None
If not None, this samples attribute defines chunks that will be
resampled individually.
position_attr : str
A samples attribute with positional information that is passed
to scipy.signal.resample. If not None, the output dataset will
also contain a sample attribute of this name, with updated
positional information (this is, however, only meaningful for
equally spaced samples).
attr_strategy : {'remove', 'sample', 'resample'}
Strategy to process sample attributes during mapping. 'remove' will
cause all sample attributes to be removed. 'sample' will pick orginal
attribute values matching the new resampling frequency (e.g. every
10th), and 'resample' will also apply the actual data resampling
procedure to the attributes as well (which might not be possible, e.g.
for literal attributes).
"""
Mapper.__init__(self, inspace=inspace)
self.__num = num
self.__window_args = window
self.__chunks_attr = chunks_attr
self.__position_attr = position_attr
self.__attr_strategy = attr_strategy
def __init__(self, params=None, param_est=None, chunks_attr="chunks", dtype="float64", **kwargs):
"""
Parameters
----------
params : None or tuple(mean, std) or dict
Fixed Z-Scoring parameters (mean, standard deviation). If provided,
no parameters are estimated from the data. It is possible to specify
individual parameters for each chunk by passing a dictionary with the
chunk ids as keys and the parameter tuples as values. If None,
parameters will be estimated from the training data.
param_est : None or tuple(attrname, attrvalues)
Limits the choice of samples used for automatic parameter estimation
to a specific subset identified by a set of a given sample attribute
values. The tuple should have the name of that sample
attribute as the first element, and a sequence of attribute values
as the second element. If None, all samples will be used for parameter
estimation.
chunks_attr : str or None
If provided, it specifies the name of a samples attribute in the
training data, unique values of which will be used to identify chunks of
samples, and to perform individual Z-scoring within them.
dtype : Numpy dtype, optional
Target dtype that is used for upcasting, in case integer data is to be
Z-scored.
"""
Mapper.__init__(self, **kwargs)
self.__chunks_attr = chunks_attr
self.__params = params
self.__param_est = param_est
self.__params_dict = None
self.__dtype = dtype
# secret switch to perform in-place z-scoring
self._secret_inplace_zscore = False
def __init__(self, selector=None, demean=True):
"""Initialize the ProjectionMapper
Parameters
----------
selector : None or list
Which components (i.e. columns of the projection matrix)
should be used for mapping. If `selector` is `None` all
components are used. If a list is provided, all list
elements are treated as component ids and the respective
components are selected (all others are discarded).
demean : bool
Either data should be demeaned while computing
projections and applied back while doing reverse()
"""
Mapper.__init__(self)
# by default we want to wipe the feature attributes out during mapping
self._fa_filter = []
self._selector = selector
self._proj = None
"""Forward projection matrix."""
self._recon = None
"""Reverse projection (reconstruction) matrix."""
self._demean = demean
"""Flag whether to demean the to be projected data, prior to projection.
"""
self._offset_in = None
"""Offset (most often just mean) in the input space"""
self._offset_out = None
"""Offset (most often just mean) in the output space"""
def __init__(self, dim=1, wavelet='sym4', mode='per', maxlevel=None):
"""Initialize _WaveletMapper mapper
:Parameters:
dim : int or tuple of int
dimensions to work across (for now just scalar value, ie 1D
transformation) is supported
wavelet : basestring
one from the families available withing pywt package
mode : basestring
periodization mode
maxlevel : int or None
number of levels to use. If None - automatically selected by pywt
"""
Mapper.__init__(self)
self._dim = dim
"""Dimension to work along"""
self._maxlevel = maxlevel
"""Maximal level of decomposition. None for automatic"""
if not wavelet in pywt.wavelist():
raise ValueError, \
"Unknown family of wavelets '%s'. Please use one " \
"available from the list %s" % (wavelet, pywt.wavelist())
self._wavelet = wavelet
"""Wavelet family to use"""
if not mode in pywt.MODES.modes:
raise ValueError, \
"Unknown periodization mode '%s'. Please use one " \
"available from the list %s" % (mode, pywt.MODES.modes)
self._mode = mode
"""Periodization mode"""
def __init__(self, selector=None, demean=True):
"""Initialize the ProjectionMapper
Parameters
----------
selector : None or list
Which components (i.e. columns of the projection matrix)
should be used for mapping. If `selector` is `None` all
components are used. If a list is provided, all list
elements are treated as component ids and the respective
components are selected (all others are discarded).
demean : bool
Either data should be demeaned while computing
projections and applied back while doing reverse()
"""
Mapper.__init__(self)
# by default we want to wipe the feature attributes out during mapping
self._fa_filter = []
self._selector = selector
self._proj = None
"""Forward projection matrix."""
self._recon = None
"""Reverse projection (reconstruction) matrix."""
self._demean = demean
"""Flag whether to demean the to be projected data, prior to projection.
"""
self._offset_in = None
"""Offset (most often just mean) in the input space"""
self._offset_out = None
"""Offset (most often just mean) in the output space"""
def __init__(self, axis, fx, fxargs=None, uattrs=None,
attrfx='merge'):
"""
Parameters
----------
axis : {'samples', 'features'}
fx : callable
fxargs : tuple
uattrs : list
List of attribute names to consider. All possible combinations
of unique elements of these attributes are used to determine the
sample groups to operate on.
attrfx : callable
Functor that is called with each sample attribute elements matching
the respective samples group. By default the unique value is
determined. If the content of the attribute is not uniform for a
samples group a unique string representation is created.
If `None`, attributes are not altered.
"""
Mapper.__init__(self)
if not axis in ['samples', 'features']:
raise ValueError("%s `axis` arguments can only be 'samples' or "
"'features' (got: '%s')." % repr(axis))
self.__axis = axis
self.__uattrs = uattrs
self.__fx = fx
if not fxargs is None:
self.__fxargs = fxargs
else:
self.__fxargs = ()
if attrfx == 'merge':
self.__attrfx = _uniquemerge2literal
else:
self.__attrfx = attrfx
def __init__(self, node, nodeargs=None, inspace=None):
"""
Parameters
----------
node : mdp.Node instance
This node instance is taken as the pristine source of which a
copy is made for actual processing upon each training attempt.
nodeargs : dict
Dictionary for additional arguments for all calls to the MDP
node. The dictionary key's meaning is as follows:
'train'
Arguments for calls to `Node.train()`
'stoptrain'
Arguments for calls to `Node.stop_training()`
'exec'
Arguments for calls to `Node.execute()`
'inv'
Arguments for calls to `Node.inverse()`
The value for each item is always a 2-tuple, consisting of a
tuple (for the arguments), and a dictionary (for keyword
arguments), i.e. ((), {}). Both, tuple and dictionary have to be
provided even if they are empty.
inspace : see base class
"""
# TODO: starting from MDP2.5 this check should become:
# TODO: if node.has_multiple_training_phases():
if not len(node._train_seq) == 1:
raise ValueError("MDPNodeMapper does not support MDP nodes with "
"multiple training phases.")
Mapper.__init__(self, inspace=inspace)
self.__pristine_node = None
self.node = node
self.nodeargs = nodeargs
def __init__(self, axis, fx, fxargs=None, uattrs=None, attrfx='merge'):
"""
Parameters
----------
axis : {'samples', 'features'}
fx : callable
fxargs : tuple
uattrs : list
List of attribute names to consider. All possible combinations
of unique elements of these attributes are used to determine the
sample groups to operate on.
attrfx : callable
Functor that is called with each sample attribute elements matching
the respective samples group. By default the unique value is
determined. If the content of the attribute is not uniform for a
samples group a unique string representation is created.
If `None`, attributes are not altered.
"""
Mapper.__init__(self)
if not axis in ['samples', 'features']:
raise ValueError("%s `axis` arguments can only be 'samples' or "
"'features' (got: '%s')." % repr(axis))
self.__axis = axis
self.__uattrs = uattrs
self.__fx = fx
if not fxargs is None:
self.__fxargs = fxargs
else:
self.__fxargs = ()
if attrfx == 'merge':
self.__attrfx = _uniquemerge2literal
else:
self.__attrfx = attrfx
def __init__(self,num_surrogates=10,blocksize=None,*args,**kwargs):
Mapper.__init__(self,*args,**kwargs)
self._num_surrogates = num_surrogates
self._clusters = [] # Will become list of tuples (channel, band, (start,end), probability)
self._is_trained = False
#Shape for each sample of the data this mapper was trained on
self._sample_shape = None
self._blocksize = blocksize
def __init__(self, num_surrogates=10, blocksize=None, *args, **kwargs):
Mapper.__init__(self, *args, **kwargs)
self._num_surrogates = num_surrogates
self._clusters = [
] # Will become list of tuples (channel, band, (start,end), probability)
self._is_trained = False
#Shape for each sample of the data this mapper was trained on
self._sample_shape = None
self._blocksize = blocksize
def __init__(self, shape=None, **kwargs):
"""
Parameters
----------
shape : tuple
The shape of a single sample. If this argument is given the mapper
is going to be fully configured and no training is necessary anymore.
"""
Mapper.__init__(self, **kwargs)
self.__origshape = None
self.__nfeatures = None
if not shape is None:
self._train_with_shape(shape)
def __init__(self, shape=None, **kwargs):
"""
Parameters
----------
shape : tuple
The shape of a single sample. If this argument is given the mapper
is going to be fully configured and no training is necessary anymore.
"""
Mapper.__init__(self, auto_train=True, **kwargs)
self.__origshape = None
self.__nfeatures = None
if not shape is None:
self._train_with_shape(shape)
def __init__(self, mask, **kwargs):
"""Initialize MaskMapper
:Parameters:
mask : array
an array in the original dataspace and its nonzero elements are
used to define the features included in the dataset
"""
Mapper.__init__(self, **kwargs)
self.__mask = self.__maskdim = self.__masksize = \
self.__masknonzerosize = self.__forwardmap = \
self.__masknonzero = None # to make pylint happy
self._initMask(mask)
def __init__(self,
polyord=1,
chunks_attr=None,
opt_regs=None,
inspace=None):
"""
Parameters
----------
polyord : int or list, optional
Order of the Legendre polynomial to remove from the data. This
will remove every polynomial up to and including the provided
value. For example, 3 will remove 0th, 1st, 2nd, and 3rd order
polynomials from the data. np.B.: The 0th polynomial is the
baseline shift, the 1st is the linear trend.
If you specify a single int and `chunks_attr` is not None, then this value
is used for each chunk. You can also specify a different polyord
value for each chunk by providing a list or ndarray of polyord
values the length of the number of chunks.
chunks_attr : str or None
If None, the whole dataset is detrended at once. Otherwise, the given
samples attribute (given by its name) is used to define chunks of the
dataset that are processed individually. In that case, all the samples
within a chunk should be in contiguous order and the chunks should be
sorted in order from low to high -- unless the dataset provides
information about the coordinate of each sample in the space that
should be spanned be the polynomials (see `inspace` argument).
opt_regs : list or None
Optional list of sample attribute names that should be used as
additional regressors. One example would be to regress out motion
parameters.
inspace : str or None
If not None, a samples attribute of the same name is added to the
mapped dataset that stores the coordinates of each sample in the
space that is spanned by the polynomials. If an attribute of that
name is already present in the input dataset its values are interpreted
as sample coordinates in the space that should be spanned by the
polynomials.
"""
Mapper.__init__(self, inspace=inspace)
self.__chunks_attr = chunks_attr
self.__polyord = polyord
self.__opt_reg = opt_regs
# things that come from train()
self._polycoords = None
self._regs = None
# secret switch to perform in-place detrending
self._secret_inplace_detrend = False
def __init__(self, polyord=1, chunks_attr=None, opt_regs=None, **kwargs):
"""
Parameters
----------
polyord : int or list, optional
Order of the Legendre polynomial to remove from the data. This
will remove every polynomial up to and including the provided
value. For example, 3 will remove 0th, 1st, 2nd, and 3rd order
polynomials from the data. np.B.: The 0th polynomial is the
baseline shift, the 1st is the linear trend.
If you specify a single int and `chunks_attr` is not None, then this value
is used for each chunk. You can also specify a different polyord
value for each chunk by providing a list or ndarray of polyord
values the length of the number of chunks.
chunks_attr : str or None
If None, the whole dataset is detrended at once. Otherwise, the given
samples attribute (given by its name) is used to define chunks of the
dataset that are processed individually. In that case, all the samples
within a chunk should be in contiguous order and the chunks should be
sorted in order from low to high -- unless the dataset provides
information about the coordinate of each sample in the space that
should be spanned be the polynomials (see `inspace` argument).
opt_regs : list or None
Optional list of sample attribute names that should be used as
additional regressors. One example would be to regress out motion
parameters.
space : str or None
If not None, a samples attribute of the same name is added to the
mapped dataset that stores the coordinates of each sample in the
space that is spanned by the polynomials. If an attribute of that
name is already present in the input dataset its values are interpreted
as sample coordinates in the space that should be spanned by the
polynomials.
"""
self.__chunks_attr = chunks_attr
self.__polyord = polyord
self.__opt_reg = opt_regs
# things that come from train()
self._polycoords = None
self._regs = None
# secret switch to perform in-place detrending
self._secret_inplace_detrend = False
# need to init last to prevent base class puking
Mapper.__init__(self, **kwargs)
def __repr__(self):
s = Mapper.__repr__(self).rstrip(' )')
# beautify
if not s[-1] == '(':
s += ' '
s += 'kshape=%s, niter=%i, learning_rate=%f, iradius=%f)' \
% (str(tuple(self.kshape)), self.niter, self.lrate,
self.radius)
return s
def __init__(self, shape=None, maxdims=None, **kwargs):
"""
Parameters
----------
shape : tuple
The shape of a single sample. If this argument is given the mapper
is going to be fully configured and no training is necessary anymore.
maxdims : int or None
The maximum number of dimensions to flatten (starting with the first).
If None, all axes will be flattened.
"""
# by default auto train
kwargs['auto_train'] = kwargs.get('auto_train', True)
Mapper.__init__(self, **kwargs)
self.__origshape = None # pylint pacifier
self.__maxdims = maxdims
if not shape is None:
self._train_with_shape(shape)
def __repr__(self):
s = Mapper.__repr__(self).rstrip(' )')
# beautify
if not s[-1] == '(':
s += ' '
s += 'kshape=%s, niter=%i, learning_rate=%f, iradius=%f)' \
% (str(tuple(self.kshape)), self.niter, self.lrate,
self.radius)
return s
def __init__(self, kshape, niter, learning_rate=0.005,
iradius=None):
"""
Parameters
----------
kshape : (int, int)
Shape of the internal Kohonen layer. Currently, only 2D Kohonen
layers are supported, although the length of an axis might be set
to 1.
niter : int
Number of iteration during network training.
learning_rate : float
Initial learning rate, which will continuously decreased during
network training.
iradius : float or None
Initial radius of the Gaussian neighborhood kernel radius, which
will continuously decreased during network training. If `None`
(default) the radius is set equal to the longest edge of the
Kohonen layer.
"""
# init base class
Mapper.__init__(self)
self.kshape = np.array(kshape, dtype='int')
if iradius is None:
self.radius = self.kshape.max()
else:
self.radius = iradius
# learning rate
self.lrate = learning_rate
# number of training iterations
self.niter = niter
# precompute whatever can be done
# scalar for decay of learning rate and radius across all iterations
self.iter_scale = self.niter / np.log(self.radius)
# the internal kohonen layer
self._K = None
def __init__(self, k, algorithm='lle', **kwargs):
"""
:Parameters:
k: int
Number of nearest neighbor to be used by the algorithm.
algorithm: 'lle' | 'hlle'
Either use the standard LLE algorithm or Hessian Linear Local
Embedding (HLLE).
**kwargs:
Additional arguments are passed to the underlying MDP node.
Most importantly this is the `output_dim` argument, that determines
the number of dimensions to mapper is using as output space.
"""
# no meaningful metric
Mapper.__init__(self, metric=None)
self._algorithm = algorithm
self._node_kwargs = kwargs
self._k = k
self._node = None
def __init__(self, startpoints, boxlength, offset=0,
collision_resolution='mean'):
"""
:Parameters:
startpoints: sequence
Index values along the first axis of 'data'.
boxlength: int
The number of elements after 'startpoint' along the first axis of
'data' to be considered for the boxcar.
offset: int
The offset between the provided starting point and the actual start
of the boxcar.
collision_resolution : 'mean'
if a sample belonged to multiple output samples, then on reverse,
how to resolve the value
"""
Mapper.__init__(self)
startpoints = N.asanyarray(startpoints)
if N.issubdtype(startpoints.dtype, 'i'):
self.startpoints = startpoints
else:
if __debug__:
debug('MAP', "Boxcar: obtained startpoints are not of int type."
" Rounding and changing dtype")
self.startpoints = N.asanyarray(N.round(startpoints), dtype='i')
# Sanity checks
if boxlength < 1:
raise ValueError, "Boxlength lower than 1 makes no sense."
if boxlength - int(boxlength) != 0:
raise ValueError, "boxlength must be an integer value."
self.boxlength = int(boxlength)
self.offset = offset
self.__selectors = None
if not collision_resolution in self._COLLISION_RESOLUTIONS:
raise ValueError, "Unknown method to resolve the collision." \
" Valid are %s" % self._COLLISION_RESOLUTIONS
self.__collision_resolution = collision_resolution
def __init__(self, kshape, niter, learning_rate=0.005, iradius=None):
"""
Parameters
----------
kshape : (int, int)
Shape of the internal Kohonen layer. Currently, only 2D Kohonen
layers are supported, although the length of an axis might be set
to 1.
niter : int
Number of iteration during network training.
learning_rate : float
Initial learning rate, which will continuously decreased during
network training.
iradius : float or None
Initial radius of the Gaussian neighborhood kernel radius, which
will continuously decreased during network training. If `None`
(default) the radius is set equal to the longest edge of the
Kohonen layer.
"""
# init base class
Mapper.__init__(self)
self.kshape = np.array(kshape, dtype='int')
if iradius is None:
self.radius = self.kshape.max()
else:
self.radius = iradius
# learning rate
self.lrate = learning_rate
# number of training iterations
self.niter = niter
# precompute whatever can be done
# scalar for decay of learning rate and radius across all iterations
self.iter_scale = self.niter / np.log(self.radius)
# the internal kohonen layer
self._K = None
def __init__(self,
num,
window=None,
chunks_attr=None,
position_attr=None,
attr_strategy='remove',
inspace=None):
"""
Parameters
----------
num : int
Number of output samples. If operating on chunks, this is the number
of samples per chunk.
window : str or float or tuple
Passed to scipy.signal.resample
chunks_attr : str or None
If not None, this samples attribute defines chunks that will be
resampled individually.
position_attr : str
A samples attribute with positional information that is passed
to scipy.signal.resample. If not None, the output dataset will
also contain a sample attribute of this name, with updated
positional information (this is, however, only meaningful for
equally spaced samples).
attr_strategy : {'remove', 'sample', 'resample'}
Strategy to process sample attributes during mapping. 'remove' will
cause all sample attributes to be removed. 'sample' will pick orginal
attribute values matching the new resampling frequency (e.g. every
10th), and 'resample' will also apply the actual data resampling
procedure to the attributes as well (which might not be possible, e.g.
for literal attributes).
"""
Mapper.__init__(self, inspace=inspace)
self.__num = num
self.__window_args = window
self.__chunks_attr = chunks_attr
self.__position_attr = position_attr
self.__attr_strategy = attr_strategy
def __init__(self, startpoints, boxlength, offset=0, **kwargs):
"""
Parameters
----------
startpoints : sequence
Index values along the first axis of 'data'.
boxlength : int
The number of elements after 'startpoint' along the first axis of
'data' to be considered for the boxcar.
offset : int
The offset between the provided starting point and the actual start
of the boxcar.
"""
Mapper.__init__(self, **kwargs)
self._outshape = None
startpoints = np.asanyarray(startpoints)
if np.issubdtype(startpoints.dtype, 'i'):
self.startpoints = startpoints
else:
if __debug__:
debug('MAP', "Boxcar: obtained startpoints are not of int type."
" Rounding and changing dtype")
self.startpoints = np.asanyarray(np.round(startpoints), dtype='i')
# Sanity checks
if boxlength < 1:
raise ValueError, "Boxlength lower than 1 makes no sense."
if boxlength - int(boxlength) != 0:
raise ValueError, "boxlength must be an integer value."
self.boxlength = int(boxlength)
self.offset = offset
self.__selectors = None
# build a list of list where each sublist contains the indexes of to be
# averaged data elements
self.__selectors = [ slice(i + offset, i + offset + boxlength) \
for i in startpoints ]
def __init__(self, fx=FirstAxisMean):
"""Initialize the PCAMapper
Parameters:
startpoints: A sequence of index value along the first axis of
'data'.
boxlength: The number of elements after 'startpoint' along the
first axis of 'data' to be considered for averaging.
offset: The offset between the starting point and the
averaging window (boxcar).
collision_resolution : string
if a sample belonged to multiple output samples, then on reverse,
how to resolve the value (choices: 'mean')
"""
Mapper.__init__(self)
self.__fx = fx
self.__uniquechunks = None
self.__uniquelabels = None
self.__chunks = None
self.__labels = None
self.__datashape = None
def __init__(self, startpoints, boxlength, offset=0, **kwargs):
"""
Parameters
----------
startpoints : sequence
Index values along the first axis of 'data'.
boxlength : int
The number of elements after 'startpoint' along the first axis of
'data' to be considered for the boxcar.
offset : int
The offset between the provided starting point and the actual start
of the boxcar.
"""
Mapper.__init__(self, **kwargs)
self._outshape = None
startpoints = np.asanyarray(startpoints)
if np.issubdtype(startpoints.dtype, 'i'):
self.startpoints = startpoints
else:
if __debug__:
debug('MAP', "Boxcar: obtained startpoints are not of int type."
" Rounding and changing dtype")
self.startpoints = np.asanyarray(np.round(startpoints), dtype='i')
# Sanity checks
if boxlength < 1:
raise ValueError, "Boxlength lower than 1 makes no sense."
if boxlength - int(boxlength) != 0:
raise ValueError, "boxlength must be an integer value."
self.boxlength = int(boxlength)
self.offset = offset
self.__selectors = None
# build a list of list where each sublist contains the indexes of to be
# averaged data elements
self.__selectors = [ slice(i + offset, i + offset + boxlength) \
for i in startpoints ]
def __init__(self, params=None, param_est=None, chunks_attr='chunks',
dtype='float64', inspace=None):
"""
Parameters
----------
params : None or tuple(mean, std) or dict
Fixed Z-Scoring parameters (mean, standard deviation). If provided,
no parameters are estimated from the data. It is possible to specify
individual parameters for each chunk by passing a dictionary with the
chunk ids as keys and the parameter tuples as values. If None,
parameters will be estimated from the training data.
param_est : None or tuple(attrname, attrvalues)
Limits the choice of samples used for automatic parameter estimation
to a specific subset identified by a set of a given sample attribute
values. The tuple should have the name of that sample
attribute as the first element, and a sequence of attribute values
as the second element. If None, all samples will be used for parameter
estimation.
chunks_attr : str or None
If provided, it specifies the name of a samples attribute in the
training data, unique values of which will be used to identify chunks of
samples, and to perform individual Z-scoring within them.
dtype : Numpy dtype, optional
Target dtype that is used for upcasting, in case integer data is to be
Z-scored.
inspace : None
Currently, this argument has no effect.
"""
Mapper.__init__(self, inspace=inspace)
self.__chunks_attr = chunks_attr
self.__params = params
self.__param_est = param_est
self.__params_dict = None
self.__dtype = dtype
# secret switch to perform in-place z-scoring
self._secret_inplace_zscore = False
def __init__(self, flow, node_arguments=None, inspace=None):
"""
Parameters
----------
flow : mdp.Flow instance
This flow instance is taken as the pristine source of which a
copy is made for actual processing upon each training attempt.
node_arguments : tuple, list
A tuple or a list the same length as the flow. Each item is a
list of arguments for the training of the corresponding node in
the flow. If a node does not require additional arguments, None
can be provided instead. Keyword arguments are currently not
supported by mdp.Flow.
inspace : see base class
"""
if not node_arguments is None and len(node_arguments) != len(flow):
raise ValueError("Length of node_arguments (%i) does not match the "
"number of nodes in the flow (%i)."
% (len(node_arguments), len(flow)))
Mapper.__init__(self, inspace=inspace)
self.__pristine_flow = None
self.flow = flow
self.node_arguments = node_arguments
def __init__(self,
bands,
border=2,
baseline_interval=None,
data_interval=None,
Fs=1000.0,
*args,
**kwargs):
"""Initialize the FrequencyBandPowerMapper
:Parameters:
bands: list of 2-tuples
list of (fl,fh), edge-frequencies for filtering
border: int
order of the filter to be used
baseline_interval: 2-tuple of ints
indices of the interval to be used for baseline correction
data_interval: 2-tuple of ints
indices of the interval to be used for cluster search
args, kwargs:
additional arguments passed to parent class
"""
Mapper.__init__(self, *args, **kwargs)
self._bands = bands
self._border = border
self._baseline_interval = baseline_interval
self._data_interval = data_interval
self._Fs = Fs
#TODO: Perform some checks, for valid intervals etc.
#precalculate filter parameters (butter)
self._bs = list(np.zeros((len(bands))))
self._as = list(np.zeros((len(bands))))
for i_b in range(len(bands)):
[self._bs[i_b], self._as[i_b]
] = butter(border,
[bands[i_b][0] / (Fs / 2), bands[i_b][1] / (Fs / 2)],
btype="band")
def __init__(self, flow, node_arguments=None, inspace=None):
"""
Parameters
----------
flow : mdp.Flow instance
This flow instance is taken as the pristine source of which a
copy is made for actual processing upon each training attempt.
node_arguments : tuple, list
A tuple or a list the same length as the flow. Each item is a
list of arguments for the training of the corresponding node in
the flow. If a node does not require additional arguments, None
can be provided instead. Keyword arguments are currently not
supported by mdp.Flow.
inspace : see base class
"""
if not node_arguments is None and len(node_arguments) != len(flow):
raise ValueError(
"Length of node_arguments (%i) does not match the "
"number of nodes in the flow (%i)." %
(len(node_arguments), len(flow)))
Mapper.__init__(self, inspace=inspace)
self.__pristine_flow = None
self.flow = flow
self.node_arguments = node_arguments
def __init__(self, dim=1, wavelet='sym4', mode='per', maxlevel=None):
"""Initialize _WaveletMapper mapper
Parameters
----------
dim : int or tuple of int
dimensions to work across (for now just scalar value, ie 1D
transformation) is supported
wavelet : str
one from the families available withing pywt package
mode : str
periodization mode
maxlevel : int or None
number of levels to use. If None - automatically selected by pywt
"""
Mapper.__init__(self)
self._dim = dim
"""Dimension to work along"""
self._maxlevel = maxlevel
"""Maximal level of decomposition. None for automatic"""
if not wavelet in pywt.wavelist():
raise ValueError, \
"Unknown family of wavelets '%s'. Please use one " \
"available from the list %s" % (wavelet, pywt.wavelist())
self._wavelet = wavelet
"""Wavelet family to use"""
if not mode in pywt.MODES.modes:
raise ValueError, \
"Unknown periodization mode '%s'. Please use one " \
"available from the list %s" % (mode, pywt.MODES.modes)
self._mode = mode
"""Periodization mode"""
def __repr__(self):
s = Mapper.__repr__(self)
m_repr = 'shape=%s' % repr(self.__origshape)
return s.replace("(", "(%s, " % m_repr, 1)
def __repr__(self):
s = Mapper.__repr__(self)
m_repr = 'shape=%s' % repr(self.__origshape)
return s.replace("(", "(%s, " % m_repr, 1)
def __init__(self, slicearg, **kwargs):
Mapper.__init__(self, **kwargs)
self._safe_assign_slicearg(slicearg)
def __init__(self, chunks_attr=None, inspace=None):
Mapper.__init__(self, inspace=inspace)
self.__chunks_attr = chunks_attr
