<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def downsize(self):
 """ Clears all caches associated with this backend. """

        self._object_cache.clear()
        self._true_cache.clear()
        self._false_cache.clear()