Blurb:: Approximate control variate (ACV) algorithm that optimizes a mix of hierarchial and non-hierarchical schemes

Description::

This ACV variant is not yet implemented.  ACV-KL enumerates a set of free
parameters, K and L, that mix hierarchial and non-hierarchical sampling
schemes in order to obtain the best estimator for a particular budget or
accuracy target.

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Theory::

Refer to \cite GORODETSKY2020109257 for additional details.

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