evobench 0.4.2

Benchmarks for model-based optimization.

Evobench

Evobench is a collection of benchmark problems dedicated for model-based large scale optimization.

Overview

This package contains following problems.

Discrete

• trap
• step trap
• bimodal
• step bimodal
• HIFF
• Ising Spin Glass

Continuous

• trap
• step trap
• multimodal
• step multimodal
• sawtooth

Compound

You can create your own benchmark made of other benchmarks.

Getting started

pip install evobench

import evobench


trap = evobench.discrete.Trap(blocks=[4, 4, 4])

population = trap.initialize_population(population_size=1e3)
fitness = trap.evaluate_population(population)

You can also evaluate single solution.

fitness = trap.evaluate_solution(population.solutions[0])

Every time you're evaluating solutions we increment ffe counter. Solution is not evaluated again, if it didn't change. You can access it through benchmark instance.

print(trap.ffe)

Ising Spin Glass

To instantiate ISG you need to pass specific problem configuration.

from evobench.discrete import IsingSpinGlass


isg = IsingSpinGlass('IsingSpinGlass_pm_16_0')

You can find 5,000 instances at evobench\discrete\isg\data folder. Instances vary in length and complexity.

Compound Benchmark

Creating your own compound benchmarks is really easy. You just need to define your sub-benchmarks and pass them as a list. All other fuctions work just the same as with the normal Benchmark.

from evobench import CompoundBenchmark
from evobench import continuous, discrete


benchmark = CompoundBenchmark(
    benchmarks=[
        discrete.Trap(blocks=[5, 2, 4]),
        continuous.Trap(blocks=[3, 6, 4])
    ],
    use_shuffle=True,
    multiprocessing=True,
    verbose=1
)

population = benchmark.initialize_population(population_size=1000)
benchmark.evaluate_population(population)

How to implement your own function

Fully separable

You need to inherit Separable class from evobench.separable. Then just implement def evaluate_block(self, block: np.ndarray) -> int method. Best follow evobench.discrete.trap implementation.

Other

Inherit Benchmark class from evobench.benchmark. Then implement def _evaluate_solution(self, solution: Solution) -> float method.

Linkage quality

Linkage quality metrics are located at evobench.linkage.metrics. Available metrics: - fill quality

Coming soon

We'll be adding more problems in the near future. If you're looking for any particular problem, please mail us or open an issue. We're working on linkage quality metrics. Once they're published, we'll be incorporating them to this package.