Update app.py

app.py

@@ -3,12 +3,14 @@ import torch
 import transformers
 from transformers import AutoTokenizer
 from langchain import LLMChain, HuggingFacePipeline, PromptTemplate
+import os
 
+token = os.getenv("Llama2")
 
 def greet(text):
 
     model = "meta-llama/Llama-2-7b-chat-hf"
-    tokenizer = AutoTokenizer.from_pretrained(model, token=llama2)
+    tokenizer = AutoTokenizer.from_pretrained(model, token=token)
     
     pipeline = transformers.pipeline(
     "text-generation",