def cumsum(self,  axis=0):
        """
        Compute cumulative sum over rows / columns of the frame.

        :param int axis: 0 for column-wise, 1 for row-wise
        :returns: new H2OFrame with cumulative sums of the original frame.
        """
        return H2OFrame._expr(expr=ExprNode("cumsum", self, axis), cache=self._ex._cache)