def perform(self, node, block, outputs):
        (out,) = outputs
        for b in block:
            assert _is_sparse(b)
        out[0] = scipy.sparse.hstack(block, format=self.format,
                                     dtype=self.dtype)
        # Some version of scipy (at least 0.14.0.dev-c4314b0)
        # Do not cast to the wanted dtype.
        if out[0].dtype > self.dtype:
            out[0] = out[0].astype(self.dtype)
dataset/ETHPy150Open rizar/attention-lvcsr/libs/Theano/theano/sparse/basic.py/HStack.perform/operator `!=` -> `>`