How to Implement Dwave QBSOLVE in Python


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D-Wave’s qbsolv is a Python package for solving Quadratic Unconstrained Binary Optimization (QUBO) problems. It is an approximate solver that uses a hybrid approach combining a classical optimization algorithm with a D-Wave quantum annealer. The package is designed to be used as a fallback solver when a problem is too large to be solved directly on a D-Wave quantum annealer or when an exact solution is not required.

qbsolv can be used to solve QUBO problems with up to thousands of variables. It takes as input a QUBO matrix or an Ising Hamiltonian, and returns an approximate solution to the problem in the form of a binary vector that minimizes the energy of the QUBO or Ising model. The solution can be further post-processed to extract relevant information such as the optimal value of the objective function and the variables that are set to 1 in the solution.

qbsolv can be called directly from Python using a simple API, and can also be integrated into larger workflows involving other optimization tools or databases. It is available as an open-source package under the Apache 2.0 license, and can be installed using pip.

To implement D-Wave’s qbsolve in Python, you can follow these steps:

  • Install the qbsolve package:

Import the necessary packages in your Python code:

Define your problem as a QUBO or Ising model. Here is an example of a simple QUBO proble

Call qbsolv to solve the problem:

Process the response to get the solution:

Here is the complete code:

import dwave_qbsolv as qbsolv

Q = {(0,0): -1, (1,1): -1, (0,1): 2}

response = qbsolv.QBSolv().sample_qubo(Q)

solution = response.sampl



This should output the solution to the QUBO problem. Note that qbsolve is an approximate solver, so the solution may not be exact.

Method 2

Use the following code if 1st method is not working

import dwave_qbsolv as qbsolv h = {0: 0.5, 1: -1.0, 2: 0.0} J = {(0, 1): -1.0, (1, 2): 0.5, (0, 2): -1.5} response = qbsolv.QBSolv().sample_ising(h, J) solution = response.samples()[0] print(solution)

Hope you will find it well for implement dwave qbsolve in python. In this article, Ezine news express the method to implement D-Wave’s qbsolve in Python


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