def standardize(self, x):
        return self.whiten(x - self.mean)
updates min and max of training data at this block
dataset/ETHPy150Open statsmodels/statsmodels/statsmodels/sandbox/distributions/mv_normal.py/MVElliptical.standardize--crossover with--dataset/ETHPy150Open balajiln/mondrianforest/src/mondrianforest.py/update_range_stats