mne.decoding.Scaler#
- class mne.decoding.Scaler(info=None, scalings=None, with_mean=True, with_std=True)[source]#
Standardize channel data.
This class scales data for each channel. It differs from scikit-learn classes (e.g.,
sklearn.preprocessing.StandardScaler
) in that it scales each channel by estimating μ and σ using data from all time points and epochs, as opposed to standardizing each feature (i.e., each time point for each channel) by estimating using μ and σ using data from all epochs.- Parameters:
- info
mne.Info
|None
The
mne.Info
object with information about the sensors and methods of measurement. Only necessary ifscalings
is a dict or None.- scalings
dict
,str
, defaultNone
Scaling method to be applied to data channel wise.
if scalings is None (default), scales mag by 1e15, grad by 1e13, and eeg by 1e6.
if scalings is
dict
, keys are channel types and values are scale factors.if
scalings=='median'
,sklearn.preprocessing.RobustScaler
is used (requires sklearn version 0.17+).if
scalings=='mean'
,sklearn.preprocessing.StandardScaler
is used.
- with_meanbool, default
True
If True, center the data using mean (or median) before scaling. Ignored for channel-type scaling.
- with_stdbool, default
True
If True, scale the data to unit variance (
scalings='mean'
), quantile range (scalings='median
), or using channel type ifscalings
is a dict or None).
- info
Methods
fit
(epochs_data[, y])Standardize data across channels.
fit_transform
(epochs_data[, y])Fit to data, then transform it.
Get metadata routing of this object.
get_params
([deep])Get parameters for this estimator.
inverse_transform
(epochs_data)Invert standardization of data across channels.
set_fit_request
(*[, epochs_data])Request metadata passed to the
fit
method.set_inverse_transform_request
(*[, epochs_data])Request metadata passed to the
inverse_transform
method.set_output
(*[, transform])Set output container.
set_params
(**params)Set the parameters of this estimator.
set_transform_request
(*[, epochs_data])Request metadata passed to the
transform
method.transform
(epochs_data)Standardize data across channels.
- fit_transform(epochs_data, y=None)[source]#
Fit to data, then transform it.
Fits transformer to epochs_data and y and returns a transformed version of epochs_data.
- Parameters:
- Returns:
- X
array
, shape (n_epochs, n_channels, n_times) The data concatenated over channels.
- X
Notes
This function makes a copy of the data before the operations and the memory usage may be large with big data.
- get_metadata_routing()[source]#
Get metadata routing of this object.
Please check User Guide on how the routing mechanism works.
- Returns:
- routing
MetadataRequest
A
MetadataRequest
encapsulating routing information.
- routing
- inverse_transform(epochs_data)[source]#
Invert standardization of data across channels.
- Parameters:
- epochs_dataarray, shape ([n_epochs, ]n_channels, n_times)
The data.
- Returns:
- X
array
, shape (n_epochs, n_channels, n_times) The data concatenated over channels.
- X
Notes
This function makes a copy of the data before the operations and the memory usage may be large with big data.
- set_fit_request(*, epochs_data: bool | None | str = '$UNCHANGED$') Scaler [source]#
Request metadata passed to the
fit
method.Note that this method is only relevant if
enable_metadata_routing=True
(seesklearn.set_config()
). Please see User Guide on how the routing mechanism works.The options for each parameter are:
True
: metadata is requested, and passed tofit
if provided. The request is ignored if metadata is not provided.False
: metadata is not requested and the meta-estimator will not pass it tofit
.None
: metadata is not requested, and the meta-estimator will raise an error if the user provides it.str
: metadata should be passed to the meta-estimator with this given alias instead of the original name.
The default (
sklearn.utils.metadata_routing.UNCHANGED
) retains the existing request. This allows you to change the request for some parameters and not others.New in v1.3.
Note
This method is only relevant if this estimator is used as a sub-estimator of a meta-estimator, e.g. used inside a
Pipeline
. Otherwise it has no effect.
- set_inverse_transform_request(*, epochs_data: bool | None | str = '$UNCHANGED$') Scaler [source]#
Request metadata passed to the
inverse_transform
method.Note that this method is only relevant if
enable_metadata_routing=True
(seesklearn.set_config()
). Please see User Guide on how the routing mechanism works.The options for each parameter are:
True
: metadata is requested, and passed toinverse_transform
if provided. The request is ignored if metadata is not provided.False
: metadata is not requested and the meta-estimator will not pass it toinverse_transform
.None
: metadata is not requested, and the meta-estimator will raise an error if the user provides it.str
: metadata should be passed to the meta-estimator with this given alias instead of the original name.
The default (
sklearn.utils.metadata_routing.UNCHANGED
) retains the existing request. This allows you to change the request for some parameters and not others.New in v1.3.
Note
This method is only relevant if this estimator is used as a sub-estimator of a meta-estimator, e.g. used inside a
Pipeline
. Otherwise it has no effect.
- set_output(*, transform=None)[source]#
Set output container.
See Introducing the set_output API for an example on how to use the API.
- Parameters:
- transform{“default”, “pandas”, “polars”}, default=None
Configure output of
transform
andfit_transform
.“default”: Default output format of a transformer
“pandas”: DataFrame output
“polars”: Polars output
None: Transform configuration is unchanged
New in v1.4: “polars” option was added.
- Returns:
- self
estimator
instance Estimator instance.
- self
- set_params(**params)[source]#
Set the parameters of this estimator.
The method works on simple estimators as well as on nested objects (such as
Pipeline
). The latter have parameters of the form<component>__<parameter>
so that it’s possible to update each component of a nested object.
- set_transform_request(*, epochs_data: bool | None | str = '$UNCHANGED$') Scaler [source]#
Request metadata passed to the
transform
method.Note that this method is only relevant if
enable_metadata_routing=True
(seesklearn.set_config()
). Please see User Guide on how the routing mechanism works.The options for each parameter are:
True
: metadata is requested, and passed totransform
if provided. The request is ignored if metadata is not provided.False
: metadata is not requested and the meta-estimator will not pass it totransform
.None
: metadata is not requested, and the meta-estimator will raise an error if the user provides it.str
: metadata should be passed to the meta-estimator with this given alias instead of the original name.
The default (
sklearn.utils.metadata_routing.UNCHANGED
) retains the existing request. This allows you to change the request for some parameters and not others.New in v1.3.
Note
This method is only relevant if this estimator is used as a sub-estimator of a meta-estimator, e.g. used inside a
Pipeline
. Otherwise it has no effect.
- transform(epochs_data)[source]#
Standardize data across channels.
- Parameters:
- epochs_data
array
, shape (n_epochs, n_channels[, n_times]) The data.
- epochs_data
- Returns:
- X
array
, shape (n_epochs, n_channels, n_times) The data concatenated over channels.
- X
Notes
This function makes a copy of the data before the operations and the memory usage may be large with big data.