Confidence Interval

Using jax to interpolate is the default method for calculating the confidence interval in UQPCEGroup as of v1.0.1 of UQPCE. This method is recommended.

The UQPCEGroup option use_tanh_ci can be set to True to use the prior arguments and support the prior method of calculating the confidence interval detailed [here]{https://doi.org/10.2514/1.C037976}. This is not recommended due to the nuance of choosing appropriate activation function parameters.