[Mne_analysis] label_sign_flip

[Tal Linzen]

Dear MNE-python users,

There's a new function in label.py called label_sign_flip. It is used in
one of the examples:

# compute sign flip to avoid signal cancelation when averaging signed values
flip = mne.label_sign_flip(label, inverse_operator['src'])

Could someone explain in a bit more detail what this function is designed
to do and when it should be used?

Thanks.
Tal
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