Sleipnir

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Sleipnir is a reverse mode autodiff library, interior-point method, and NLP solver DSL for C++23 and Python. The DSL automatically chooses the best solver based on the problem structure.

#include <print>

#include <sleipnir/optimization/problem.hpp>

int main() {
  // Find the x, y pair with the largest product for which x + 3y = 36
  slp::Problem<double> problem;

  auto x = problem.decision_variable();
  auto y = problem.decision_variable();

  problem.maximize(x * y);
  problem.subject_to(x + 3 * y == 36);
  problem.solve();

  // x = 18.0, y = 6.0
  std::println("x = {}, y = {}", x.value(), y.value());
}

#!/usr/bin/env python

from sleipnir.optimization import Problem


def main():
    # Find the x, y pair with the largest product for which x + 3y = 36
    problem = Problem()

    x, y = problem.decision_variable(2)

    problem.maximize(x * y)
    problem.subject_to(x + 3 * y == 36)
    problem.solve()

    # x = 18.0, y = 6.0
    print(f"x = {x.value()}, y = {y.value()}")


if __name__ == "__main__":
    main()

Sleipnir supports easy cross-compilation via CMake toolchain files, provides good performance by default, and contains clean reference implementations of various solvers with links to explanatory material.

The C++ API also supports arbitrary scalar types, so users can specify higher precision floating-point types at the cost of speed.

Install

The following platforms are supported:

  • Windows
  • Linux
    • OS: Ubuntu 24.04
    • Runtime: GCC 14 libstdc++ (run sudo apt install g++-14)
  • macOS
    • OS: macOS 14.5
    • Runtime: Apple Clang 16.0.0 libc++ from Xcode 16.2 (run xcode-select --install)

To use Sleipnir within a CMake project, add the following to CMakeLists.txt:

include(FetchContent)

FetchContent_Declare(
    Sleipnir
    GIT_REPOSITORY https://github.com/SleipnirGroup/Sleipnir.git
    GIT_TAG main
    EXCLUDE_FROM_ALL
    SYSTEM
)
FetchContent_MakeAvailable(Sleipnir)

target_link_libraries(MyApp PUBLIC Sleipnir::Sleipnir)

To use Sleipnir in Python, install sleipnirgroup-jormungandr from PyPI:

pip install sleipnirgroup-jormungandr

If necessary, follow these instructions to build from source.

Docs

See the C++ API docs, Python API docs, and usage docs.

Examples

See the examples folder, C++ optimization unit tests, and Python optimization unit tests.

Benchmarks

See the benchmarks folder.

Contributing

See the contributing docs.

Project links

Data verified by PyPI on Sep 5, 2026
Data provided by the project maintainers, verified at the time the release was uploaded to PyPI.

Key dates

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License expression

BSD-3-Clause
View SPDX License List

Requires

Python >=3.12

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