def __init__(self, axis=None, sparse_grad=True):
        super(SpSum, self).__init__()
        self.axis = axis
        self.structured = sparse_grad
        if self.axis not in (None, 0, 1):
            raise ValueError('Illegal value for self.axis.')
dataset/ETHPy150Open rizar/attention-lvcsr/libs/Theano/theano/sparse/basic.py/SpSum.__init__/original