Add configurable program length check

Author: tonyxty

openevolve/config.py

@@ -142,6 +142,9 @@ class PromptConfig:
     max_artifact_bytes: int = 20 * 1024  # 20KB in prompt
     artifact_security_filter: bool = True
 
+    # Improvement areas
+    code_length_threshold: Optional[int] = 500
+
 
 @dataclass
 class DatabaseConfig:

openevolve/prompt/sampler.py

@@ -171,7 +171,7 @@ def _identify_improvement_areas(
         improvement_areas = []
 
         # Check program length
-        if len(current_program) > 500:
+        if self.config.code_length_threshold and len(current_program) > self.config.code_length_threshold:
             improvement_areas.append(
                 "Consider simplifying the code to improve readability and maintainability"
             )