def batch_update(self, values, w=1):
        for x in values:
            self.update(x, w)
        self.compress()
        return
Update the t-digest with an iterable of values. This assumes all points have the 
dataset/ETHPy150Open CamDavidsonPilon/tdigest/tdigest/tdigest.py/TDigest.batch_update