# CmaOptimizer

Optimizer based on the CMA-ES algorithm by [Hansen].

This is an abstract base class, use a derived class instead.

**Inherits from** Optimizer.

**Inherited by** CmaOptimizerCCMAES, CmaOptimizerShark3, CmaOptimizerSpot.

### Public Attributes

Parameter | Type | Description |
---|---|---|

mu_ | int | Mu parameter of CMA-ES. |

lambda_ | int | Lambda parameter of CMA-ES. |

sigma_ | double | Initial Sigma parameter of CMA-ES. |

window_size | size_t | Window size used for fitness prediction; default = 500. |

random_seed | long | Random seed that will determine the randomness during the optimization. |

flat_fitness_epsilon_ | double | Epsilon value to detect flat fitness; default = 1e-6. |

init_file | path | Parameter file (.par) to be used for initial parameter values. |

use_init_file | bool | Use init_file (if exists); default = true. |

use_init_file_std | bool | Use the standard deviations from the init_file; when set to false, the initial standard deviation is computed as follows: STDEV = parameter value * init_std_factor + init_std_offset; default = true. |

init_file_std_factor | double | Factor by which to multiply the standard deviations from the init_file; default = 1.0. |

init_file_std_offset | double | Offset added to the standard deviations from init_file; default = 0. |

max_threads | size_t | Maximum number of threads to use for this optimization; default = 32. |

thread_priority | int | Thread priority of the optimization; 0 = lowest, 7 = highest, default = 1. |

max_generations | size_t | Number of iterations after which to stop the optimization; default = 10000. |

min_progress | double | Minimum progress after which to stop the optimization; default = 1e-6. |

min_progress_samples | size_t | Minimum number of samples after which progress is measured; default = 200. |

min_improvement_for_file_output | Real | The minimum relative improvement needed for file output; default = 0.05. |

max_generations_without_file_output | size_t | The maximum number of iterations without file output; default = 1000. |

signature_prefix | String | Prefix signature with custom string. Special tags: DATE_TIME, DATE_TIME_EXACT, SCONE_VERSION. |

signature_postfix | String | Append custom string to signature. Special tags: DATE_TIME, DATE_TIME_EXACT, SCONE_VERSION. |

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