<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _compute_diff(map1, map2):
 """ Make a map that is the difference of two maps """

        data = map1.data - map2.data
        return HpxMap(data, map1.hpx)