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Fix island population counting per child program #354

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Merged
codelion merged 1 commit into from
Dec 18, 2025
Merged

Fix island population counting per child program #354

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1 change: 0 additions & 1 deletion openevolve/config.py
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Original file line number Diff line number Diff line change
Expand Up @@ -288,7 +288,6 @@ class DatabaseConfig:
population_size: int = 1000
archive_size: int = 100
num_islands: int = 5
programs_per_island: Optional[int] = None

# Selection parameters
elite_selection_ratio: float = 0.1
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22 changes: 6 additions & 16 deletions openevolve/process_parallel.py
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Expand Up @@ -445,12 +445,6 @@ async def run_evolution(
next_iteration = current_iteration
completed_iterations = 0

# Island management
programs_per_island = self.config.database.programs_per_island or max(
1, max_iterations // (self.config.database.num_islands * 10)
)
current_island_counter = 0

# Early stopping tracking
early_stopping_enabled = self.config.early_stopping_patience is not None
if early_stopping_enabled:
Expand Down Expand Up @@ -543,16 +537,12 @@ async def run_evolution(
)

# Island management
if (
completed_iteration > start_iteration
and current_island_counter >= programs_per_island
):
self.database.next_island()
current_island_counter = 0
logger.debug(f"Switched to island {self.database.current_island}")

current_island_counter += 1
self.database.increment_island_generation()
# get current program island id
island_id = child_program.metadata.get(
"island", self.database.current_island
)
#use this to increment island generation
self.database.increment_island_generation(island_idx=island_id)

# Check migration
if self.database.should_migrate():
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