in 04_detect_segment/utils_box.py [0:0]
def rois_in_tiles_relative(tiles, rois):
rois, is_roi_in_tile = find_non_intersecting_rois(tiles, rois) # [n_tiles, n_rois, 4]
rois = zero_where(rois, tf.logical_not(is_roi_in_tile))
rois = make_rois_relative_to_tiles(tiles, rois)
# replace empty ROIs by (0,0,0,0) for clarity
is_roi_empty = find_empty_rois(rois)
rois = zero_where(rois, is_roi_empty)
return rois, is_roi_in_tile