I am studying Detectron2 implementation of Mask-RCNN.  I am trying to understand why there is a max( , 0.1) needed in masks.rasterize_polygons_within_box
    # 2. Rescale the polygons to the new box size
    ratio_h = mask_size / max(h, 0.1)
    ratio_w = mask_size / max(w, 0.1)

Here, h and w are the height and width of the box. Where does the number 0.1 come from?  Is that just to prevent a divide by zero error?
Thanks.