Created by: mathyyj

in 'models/fluid/face_detection/widerface_eval.py', we have `def get_shrink(height, width): """ Args: height (int): image height. width (int): image width. """ # avoid out of memory max_shrink_v1 = (0x7fffffff / 577.0 / (height * width))**0.5 max_shrink_v2 = ((678 * 1024 * 2.0 * 2.0) / (height * width))**0.5

def get_round(x, loc):
    str_x = str(x)
    if '.' in str_x:
        str_before, str_after = str_x.split('.')
        len_after = len(str_after)
        if len_after >= 3:
            str_final = str_before + '.' + str_after[0:loc]
            return float(str_final)
        else:
            return x

max_shrink = get_round(min(max_shrink_v1, max_shrink_v2), 2) - 0.3
if max_shrink >= 1.5 and max_shrink < 2:
    max_shrink = max_shrink - 0.1
elif max_shrink >= 2 and max_shrink < 3:
    max_shrink = max_shrink - 0.2
elif max_shrink >= 3 and max_shrink < 4:
    max_shrink = max_shrink - 0.3
elif max_shrink >= 4 and max_shrink < 5:
    max_shrink = max_shrink - 0.4
elif max_shrink >= 5:
    max_shrink = max_shrink - 0.5

shrink = max_shrink if max_shrink < 1 else 1
return shrink, max_shrink`

my question is , why there are so many ... 'magic numbers' like 0.1, 0.2, etc. Or in other word, why we do this?