<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def zero(self):
 """Return a tensor of all zeros. Examples -------- rn(3).element([ 0., 0., 0.]) """

        return self.element(np.zeros(self.shape, dtype=self.dtype,
                                     order=self.default_order))