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odunbar committed Nov 19, 2024
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The `UpdateGroup` object facilitates blocked EKP updates, based on a provided updating a series user-defined pairs of parameters and data. This allows users to enforce any *known* (in)dependences between different groups of parameters during the update.

!!! note "This improves scaling at the cost of user-imposed structure"
As many of the `Process` updates scale say with ``d^\alpha``, in the data dimension ``d`` and ``\alpha > 1`` (super-linearly), update groups with ``K`` groups of equal size will improving this scaline to ``K (\frac{d}{K})^\alpha``.
As many of the `Process` updates scale say with ``d^\alpha``, in the data dimension ``d`` and ``\alpha > 1`` (super-linearly), update groups with ``K`` groups of equal size will improving this scaling to ``K (\frac{d}{K})^\alpha``.

## Recommended construction - shown by example

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For illustration, we take code snippets from the example found in [examples/](https://github.com/CliMA/EnsembleKalmanProcesses.jl/blob/main/examples/UpdateGroups/). This example is concerned with learning several parameters in a coupled two-scale Lorenz 96 system:
```math
\begin{aligned}
\frac{\partial X_i}{\partial t} && = -X_{i-1}(X_{i-2} - X{i+1}) - X_i - GY_i + F_1 + F_2*sin(2\pi t F_3)\\
\frac{\partial Y_i}{\partial t} && = -cbY_{i+1}(Y_{i+2} - X{i-1}) - cY_i + \frac{hc}{b} X_i \\
\frac{\partial X_i}{\partial t} & = -X_{i-1}(X_{i-2} - X{i+1}) - X_i - GY_i + F_1 + F_2*\sin(2\pi t F_3)\\
\frac{\partial Y_i}{\partial t} & = -cbY_{i+1}(Y_{i+2} - X{i-1}) - cY_i + \frac{hc}{b} X_i
\end{aligned}
```
Parameters are learnt by fitting moments of a realized `X` and `Y` system, to some target moments.
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