argumentcomputer / bellpepper-gadgets

A library of gadgets compatible with bellpepper and bellperson (contact: @huitseeker)
Apache License 2.0
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Chunk proving pattern #33

Closed tchataigner closed 9 months ago

tchataigner commented 9 months ago

Goal of this PR

The goal of this PR is to create a bellpepper utility that could help us handle the loop + accumulator pattern in a circuit more efficiently.

This implementation will be able to generate a number N of circuits based on the number of intermediate accumulator values Nav and a desired number of accumulator updates per circuit Nau (N = Nav / Nau).

There is an example for a simple additive accumulator integrated in Supernova.

Usage

The current implementation only implements some chunking at the gadget level. This means that there is no actual generation of some folding steps, which would require a dependency on arecibo

From bellpepper-chunk, the user will have to implement the inner ChunkStepCircuit that will be synthesize at each fold of our RecursiveNova.

Finally, the user will also have to develop the plumbing for StepCircuit and NonUniformCircuit from arecibo. Some of the methods implementation functions can be used through the use of the API of FoldStep and InnerCircuit (see example).

Open discussion

As you may know, there was some design discussions around adding arecibo as a dependency to abstract more of the implementation load from the user.

For now we do not rely on arecibo but it could be added quite easily if we wish to do so.