Question about gradient

### Summary

Hello,
I'm quite interested by using DMFF, but I find myself somewhat puzzled, and I'd greatly appreciate your assistance in clarifying the theoretical aspects.
Specifically, I'd like to understand the process of introducing minor perturbations to the FF parameters in each iteration, followed by the use of MBAR to estimate properties based on these modified parameters, and ultimately, the computation of gradients with respect to each parameter. In essence, does MBAR have the capability to predict the energy and other system properties when presented with a new set of force field parameters?
Any help would be appreciated (@WangXinyan940).

### Motivation

using DMFF

### Suggested Solutions

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### Further Information, Files, and Links

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