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modify for MAP-Elite Algorithm #152

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Merged
codelion merged 1 commit into from
Jul 17, 2025
Merged

modify for MAP-Elite Algorithm #152

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3 changes: 2 additions & 1 deletion openevolve/config.py
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Original file line number Diff line number Diff line change
Expand Up @@ -166,7 +166,8 @@ class DatabaseConfig:
diversity_metric: str = "edit_distance" # Options: "edit_distance", "feature_based"

# Feature map dimensions for MAP-Elites
feature_dimensions: List[str] = field(default_factory=lambda: ["score", "complexity"])
# feature_dimensions: List[str] = field(default_factory=lambda: ["score", "complexity"])
feature_dimensions: List[str] = field(default_factory=lambda: ["complexity"])
feature_bins: int = 10

# Migration parameters for island-based evolution
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8 changes: 7 additions & 1 deletion openevolve/database.py
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Expand Up @@ -105,7 +105,8 @@ def __init__(self, config: DatabaseConfig):

# Feature grid for MAP-Elites
self.feature_map: Dict[str, str] = {}
self.feature_bins = config.feature_bins
self.feature_bins = max(config.feature_bins,
int(pow(config.archive_size, 1 / len(config.feature_dimensions)) + 0.99))

# Island populations
self.islands: List[Set[str]] = [set() for _ in range(config.num_islands)]
Expand Down Expand Up @@ -210,6 +211,11 @@ def add(
existing_fitness = safe_numeric_average(existing_program.metrics)
logger.info("MAP-Elites cell improved: %s (fitness: %.3f -> %.3f)",
coords_dict, existing_fitness, new_fitness)

# use MAP-Elites to manage archive
if existing_program_id in self.archive:
self.archive.discard(existing_program_id)
self.archive.add(program.id)

self.feature_map[feature_key] = program.id

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