fix: use _sample_inspirations in sample_from_island for consistent inspiration selection (fixes #437)

Author: octo-patch

openevolve/database.py

@@ -447,21 +447,11 @@ def sample_from_island(
             parent = self._sample_from_island_weighted(island_id)
             sampling_mode = "weighted"
 
-        # Select inspirations from the same island
+        # Select inspirations from the same island using the same strategy as sample()
         if num_inspirations is None:
             num_inspirations = 5  # Default for backward compatibility
 
-        # Get other programs from the island for inspirations
-        other_programs = [pid for pid in island_programs if pid != parent.id]
-
-        if len(other_programs) < num_inspirations:
-            # Not enough programs in island, use what we have
-            inspiration_ids = other_programs
-        else:
-            # Sample inspirations
-            inspiration_ids = random.sample(other_programs, num_inspirations)
-
-        inspirations = [self.programs[pid] for pid in inspiration_ids if pid in self.programs]
+        inspirations = self._sample_inspirations(parent, n=num_inspirations)
 
         logger.debug(
             f"Sampled parent {parent.id} and {len(inspirations)} inspirations from island {island_id} "