Update app.py

app.py

@@ -23,6 +23,9 @@ DEFAULT_API_URL = "https://agents-course-unit4-scoring.hf.space"
 #Load environment variables
 load_dotenv()
 
+import io
+import contextlib
+from transformers import AutoTokenizer, AutoModelForCausalLM, pipeline
 
 class ZephyrToolCallingAgentTool:
     name = "zephyr_tool_agent"