Solid is a Python framework for gradient-free optimization.
It contains basic versions of many of the most common optimization algorithms that do not require the calculation of gradients, and allows for very rapid development using them.
It's a very versatile library that's great for learning, modifying, and of course, using out-of-the-box.
See the detailed documentation here.
Current Features:
- Genetic Algorithm
- Evolutionary Algorithm
- Simulated Annealing
- Particle Swarm Optimization
- Tabu Search
- Harmony Search
- Stochastic Hill Climb
Usage:
pip install solidpy- Import the relevant algorithm
- Create a class that inherits from that algorithm, and that implements the necessary abstract methods
- Call its
.run()method, which always returns the best solution and its objective function value
Example:
from random import choice, randint, random
from string import lowercase
from Solid.EvolutionaryAlgorithm import EvolutionaryAlgorithm
class Algorithm(EvolutionaryAlgorithm):
"""
Tries to get a randomly-generated string to match string "clout"
"""
def _initial_population(self):
return list(''.join([choice(lowercase) for _ in range(5)]) for _ in range(50))
def _fitness(self, member):
return float(sum(member[i] == "clout"[i] for i in range(5)))
def _crossover(self, parent1, parent2):
partition = randint(0, len(self.population[0]) - 1)
return parent1[0:partition] + parent2[partition:]
def _mutate(self, member):
if self.mutation_rate >= random():
member = list(member)
member[randint(0,4)] = choice(lowercase)
member = ''.join(member)
return member
def test_algorithm():
algorithm = Algorithm(.5, .7, 500, max_fitness=None)
best_solution, best_objective_value = algorithm.run()
Testing
To run tests, look in the tests folder.
Use pytest; it should automatically find the test files.
Contributing
Feel free to send a pull request if you want to add any features or if you find a bug.
Check the issues tab for some potential things to do.
157 Dec 27, 2022
6 Sep 21, 2022
6 Oct 07, 2022
130 Dec 11, 2022
704 Nov 26, 2022
2.8k Dec 29, 2022
1 Feb 11, 2022
169 Dec 23, 2022
16 Oct 18, 2022
1 Feb 15, 2022
268 Jan 09, 2023
5 Dec 20, 2022
132 Dec 26, 2022
1 Dec 26, 2021
2 Jan 12, 2022
164 Dec 29, 2022
398 Dec 17, 2022
14 Dec 08, 2022
4 Nov 18, 2021
34 Aug 27, 2022