Performs hstack based on unique values in sa_label
dataset: Dataset :
input dataset.
sa_label: str :
sample attribute label according which samples in dataset are stacked.
stacked_dataset: Dataset :
A dataset where matching features are joined (hstacked). If the number of matching features differs for values in sa_label and exception is raised.
mvpa2.base.dataset.stack_by_unique_feature_attribute
mvpa2.base.dataset.vstack
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