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When I run the confidence_interval notebook I get the following error:

AttributeError                            Traceback (most recent call last)
<ipython-input-2-637cb2ef6afe> in <module>
     16 
     17 y_train, y_pred, y_lo, y_up = uq.confidence_interval(x_train, y_train, alpha=alpha,
---> 18                                                      n_boot=n_boot, sample=sample)
     19 
     20 plt.figure(figsize=(16, 9))

~/Documents/OPAL/pyOPALTools/surrogate/uq.py in confidence_interval(self, x, y, alpha, **kwargs)
    129 
    130         lo, up = bs.confidence_interval(alpha=alpha)
--> 131         lo_pce = cp.dot(poly, np.asarray(lo))
    132         up_pce = cp.dot(poly, np.asarray(up))
    133 

AttributeError: module 'chaospy' has no attribute 'dot'

For this I had to add the following fix to bootstrap.py:

-        return 2.0 * fitted - qlo, 2.0 * fitted - qhi
+        return 2.0 * np.asarray(fitted) - qlo, 2.0 * np.asarray(fitted) - qhi