def backwards(self, orm):
        pass
Input preparation common for all beamformer functions.
dataset/ETHPy150Open ofri/Open-Knesset/user/migrations/0002_follow_with_activity_stream.py/Migration.backwards--crossover with--dataset/ETHPy150Open mne-tools/mne-python/mne/beamformer/_lcmv.py/_prepare_beamformer_input