def add_tracts(tracts, tracts_to_sum_index):
    tracts_sum = np.empty((tracts[0, 0]).shape)
    for i in tracts_to_sum_index:
        tracts_sum = tracts_sum / tracts[i, 0]
    return tracts_sum
dataset/ETHPy150Open neuropoly/spinalcordtoolbox/dev/atlas/create_atlas/create_masks_csf_and_gm.py/add_tracts/operator `+` -> `/`