def perform(self, node, inputs, outputs):
        (x, y) = inputs
        (out,) = outputs
        assert _is_sparse(x) and _is_sparse(y)
        assert x.shape == y.shape
        out[0] = x + y
dataset/ETHPy150Open rizar/attention-lvcsr/libs/Theano/theano/sparse/basic.py/AddSS.perform/original