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replace differential evolution strategy #322

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benvanwerkhoven
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This pull request replaces the previous differential evolution strategy from scipy.optimize with our own implementation. There are several reasons for this, including:

  • scipy's version does not support strings as values, which are important for tuning data types in mixed precision codes
  • our own implementation can use the search space object to perform better on constrained search spaces
  • we can more easily modify this to work with parallel runners in the future

fjwillemsen
fjwillemsen approved these changes Jul 11, 2025
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@fjwillemsen fjwillemsen left a comment •
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This is a nice PR that completely revamps the Differential Evolution strategy to a strategy much more suited for auto-tuning.
The tests are passing - approved.

kernel_tuner/strategies/diff_evo.py
return population


def differential_evolution(searchspace, cost_func, bounds, popsize, maxiter, F, CR, method, constraint_aware, verbose):
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@fjwillemsen fjwillemsen Jul 11, 2025 •
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Officially Python variable names have to conform to this regex: [^[_a-z][a-z0-9_]*$.]

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Quality Gate Passed Quality Gate passed

Issues
11 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

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@benvanwerkhoven @fjwillemsen