Hypatia is a highly customizable open source interior point solver for generic conic optimization problems, written in Julia.

and preprints of our papers:

and corresponding raw results CSV files generated by our run scripts in the benchmarks folder.

## Getting help

If you need help, please ask a question on the JuMP community forum.

If you have a reproducible example of a bug, please open a GitHub issue.

## Installation

To use Hypatia, install Julia, then at the Julia REPL, type:

using Hypatia
using Pkg
Pkg.add("Hypatia")

Hypatia is an experimental solver and a work in progress, and may not run with older releases of Julia. Default options/parameters are not well-tuned, so we encourage you to experiment with these.

## Usage

Hypatia can be accessed through a low-level native Julia interface or through open-source modeling tools such as JuMP and Convex.jl. The native interface is more expressive, allowing Hypatia to solve conic models expressed with generic real floating point types and structured matrices or linear operators, for example. However, it is typically sufficient and more convenient to use JuMP.

Using JuMP, we can model a simple D-optimal experiment design problem and call Hypatia:

using LinearAlgebra
using JuMP
using Hypatia

model = Model(() -> Hypatia.Optimizer(verbose = false))
@variable(model, x[1:3] >= 0)
@constraint(model, sum(x) == 5)
@variable(model, hypo)
@objective(model, Max, hypo)
V = rand(2, 3)
Q = V * diagm(x) * V'
aff = vcat(hypo, [Q[i, j] for i in 1:2 for j in 1:i]...)
@constraint(model, aff in MOI.RootDetConeTriangle(2))

# solve and query solution
optimize!(model)
termination_status(model)
objective_value(model)
value.(x)

Many more examples using the native interface or JuMP can be found in the examples folder.

## Contributing

Comments, questions, suggestions, and improvements/extensions to the code or documentation are welcomed. Please reach out on Discourse, or submit an issue or contribute a PR on our GitHub. If contributing code, try to maintain consistent style and add docstrings or comments for clarity. New examples are welcomed and should be implemented similarly to the existing examples.

## Acknowledgements

This work has been partially funded by the National Science Foundation under grant OAC-1835443 and the Office of Naval Research under grant N00014-18-1-2079.

## Citing Hypatia

If you find Hypatia solver useful, please cite our solver paper:

@article{coey2022solving,
title={Solving natural conic formulations with {H}ypatia.jl},
author={Chris Coey and Lea Kapelevich and Juan Pablo Vielma},
year={2022},
journal={INFORMS Journal on Computing},
publisher={INFORMS},
volume={34},
number={5},
pages={2686--2699},
doi={https://doi.org/10.1287/ijoc.2022.1202}
}

If you find aspects of Hypatia's IPM implementation useful, please cite our algorithm paper:

@article{coey2022performance,
title={Performance enhancements for a generic conic interior point algorithm},
author={Chris Coey and Lea Kapelevich and Juan Pablo Vielma},
year={2023},
journal={Mathematical Programming Computation},
publisher={Springer},
volume={15},
pages={53--101},
doi={https://doi.org/10.1007/s12532-022-00226-0}
}