mvpa2.mappers.fx.mean_group_feature

mvpa2.mappers.fx.mean_group_feature(attrs, attrfx='merge')

Returns a mapper that computes the mean features of unique feature groups.

The feature groups are identified by the unique combination of all values of a set of provided feature attributes. Order of output features might differ from original and correspond to sorted order of corresponding attrs.

Parameters:

attrs : list

List of feature attributes whos unique values will be used to identify the feature groups.

attrfx : ‘merge’ or callable, optional

Callable that is used to determine the feature attributes of the computed mean features. By default this will be a string representation of all unique value of a particular attribute in any feature group. If there is only a single value in a group it will be used as the new attribute value.

Returns:

FxMapper instance. :