added code for within island evolution

Author: Akshat Gupta

openevolve/config.py

@@ -292,6 +292,16 @@ class DatabaseConfig:
     )
     feature_bins: Union[int, Dict[str, int]] = 10  # Can be int (all dims) or dict (per-dim)
     diversity_reference_size: int = 20  # Size of reference set for diversity calculation
+    feature_scaling_method: str = "minmax"  # Options: minmax, percentile. Only used when adaptive_binning is disabled.
+
+    # Adaptive binning parameters
+    use_adaptive_binning: bool = False  # Enable adaptive binning based on usage
+    adaptive_binning_interval: int = 10  # Check for rebinning every N iterations
+    adaptive_binning_min_activity: int = 5  # Minimum activity events before rebinning
+    track_failed_attempts_in_activity: bool = True  # Whether to count failed program placements (with weight 0.5) in bin activity
+
+    # Fitness comparison parameters
+    allow_equal_fitness_replacement: bool = False  # If True, programs with equal fitness can replace existing programs in MAP-Elites cells
 
     # Migration parameters for island-based evolution
     migration_interval: int = 50  # Migrate every N generations