Update backend/worker.py

backend/worker.py

@@ -6,7 +6,7 @@ import traceback
 from merge_engines.linear import merge_models
 from merge_engines.evolutionary import evolutionary_merge
 from uploader import upload_to_hf
-from memory_manager import estimate_memory, check_memory_safe
+from memory_manager import check_memory_safe
 import asyncio
 
 async def run_job_async(job_id: str, params: dict):