Update requirements.txt

requirements.txt

@@ -1,6 +1,7 @@
 fastapi>=0.110.0
 uvicorn>=0.29.0
 pydantic>=2.0.0
-transformers>=4.41.0
-bitsandbytes>=0.43.0
-torch>=2.2.0
+transformers>=4.41.0  # 需 4.41+ 版本才能支持 Qwen-0.5B
+bitsandbytes>=0.43.0  # 4bit 量化依赖
+torch>=2.2.0          # 需 2.2+ 版本支持 bfloat16
+accelerate>=0.30.0    # 辅助模型加载，避免显存碎片