pyqbpp 2026.4.5

Python bindings for QUBO++ (HUBO/QUBO symbolic computation)

PyQBPP: Python Interface for QUBO++

PyQBPP is a Python wrapper for the QUBO++ library, allowing you to model and solve combinatorial optimization problems using QUBO/HUBO formulations directly from Python.

Features

• Symbolic construction of QUBO/HUBO expressions in Python
• Access to QUBO++ solvers (Easy Solver, Exhaustive Solver, ABS3)
• Familiar Python syntax with the full power of the QUBO++ engine

Supported Environment

• Linux (Ubuntu 20.04 or later)
• x86_64 or arm64 (aarch64) CPUs
• CUDA-enabled NVIDIA GPUs
• Python 3.8 or later

Installation

PyQBPP is available on PyPI. We recommend using a Python virtual environment (venv) to install PyQBPP. No sudo privileges are required.

$ python3 -m venv ~/qbpp-env
$ source ~/qbpp-env/bin/activate
$ pip install pyqbpp

After installation, activate your QUBO++ license. The following command will activate an anonymous trial license:

$ qbpp-license -a

If you have a QUBO++ license key, activate it as follows:

$ qbpp-license -k YOUR-LICENSE-KEY -a

Quick Example

The following program finds an 8x8 permutation matrix (each row and column has exactly one 1).

import pyqbpp as qbpp

n = 8
x = qbpp.var("x", n, n)

# Each row and column has exactly one 1
f = qbpp.sum(qbpp.vector_sum(x, 0) == 1) + qbpp.sum(qbpp.vector_sum(x, 1) == 1)

f.simplify_as_binary()

solver = qbpp.EasySolver(f)
sol = solver.search({"target_energy": 0})

for i in range(n):
    print(sol(x[i]))

Example output:

[0, 1, 0, 0, 0, 0, 0, 0]
[0, 0, 0, 1, 0, 0, 0, 0]
[0, 0, 0, 0, 1, 0, 0, 0]
[0, 0, 0, 0, 0, 1, 0, 0]
[0, 0, 0, 0, 0, 0, 0, 1]
[1, 0, 0, 0, 0, 0, 0, 0]
[0, 0, 1, 0, 0, 0, 0, 0]
[0, 0, 0, 0, 0, 0, 1, 0]

Documentation

https://qubo-plus.github.io/python/