<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def load_data(self, filename):
 """ Load assimilated data from a file """

        with zopen(filename, "rt") as f:
            self._data = json.load(f, cls=MontyDecoder)