.. _method-approximate_control_variate-acv_kl:

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


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**Specification**

- *Alias:* acv_adaptive 

- *Arguments:* None


**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.



**Theory**


Refer to :cite:p:`GORODETSKY2020109257` for additional details.