<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _can_compute(self, _id, persistence):
 """ Return true if this feature stored, or is unstored, but can be computed from stored dependencies """

        if self.store and self._stored(_id, persistence):
            return True

        if self.is_root:
            return False

        return all(
            [n._can_compute(_id, persistence) for n in self.dependencies])