minor fix

app/rag.py

@@ -47,7 +47,7 @@ class ChatPDF:
             model_url="https://huggingface.co/Qwen/Qwen2-0.5B-Instruct-GGUF/resolve/main/qwen2-0_5b-instruct-fp16.gguf",
             temperature=0.1,
             max_new_tokens=256,
-            n_ctx=3900,
+            # n_ctx=3900,
             n_batch=256,
             context_window=3900, #32k
             generate_kwargs={"max_tokens": 256, "temperature": 0.1, "top_k": 3},