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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _subsampling_sanity_check(self):
 """Check for differing subsample factors. """

        dxs = np.array(self.codestream.segment[1].xrsiz)
        dys = np.array(self.codestream.segment[1].yrsiz)
        if np.any(dxs - dxs[0]) or np.any(dys - dys[0]):
            msg = ("The read_bands method should be used with the subsampling "
                   "factors are different. "
                   "\n\n{siz_segment}")
            msg = msg.format(siz_segment=str(self.codestream.segment[1]))
            raise IOError(msg)