def sym_difference(self, geom, **kwargs):
        return self._geomset_attribute('sym_difference', geom, **kwargs)
exp(x) * sigm(-x) -> sigm(x)
dataset/ETHPy150Open CollabQ/CollabQ/vendor/django/contrib/gis/db/models/query.py/GeoQuerySet.sym_difference--crossover with--dataset/ETHPy150Open rizar/attention-lvcsr/libs/Theano/theano/tensor/nnet/sigm.py/local_sigm_times_exp