flask does not work

app.py

@@ -1,24 +1,16 @@
-#from fastapi import FastAPI
-from flask import Flask
+import streamlit as st
 from transformers import GPT2LMHeadModel, GPT2Tokenizer
 import numpy as np 
 
-#app = FastAPI()
-app = Flask(__name__)
 
 model = GPT2LMHeadModel.from_pretrained('gpt2')
 tokenizer = GPT2Tokenizer.from_pretrained('gpt2')
 
-@app.get("/score/<text>")
-def score(text):
-    tokens_tensor = tokenizer.encode( text, add_special_tokens=False, return_tensors="pt")
+def score(tokens_tensor):
     loss=model(tokens_tensor, labels=tokens_tensor)[0]
-    print(text,loss)
-    return str(np.exp(loss.cpu().detach().numpy()))
+    return np.exp(loss.cpu().detach().numpy())
 
-#sentence = st.text_input("Enter the sentence","this is a well formed sentence.")
-#res = score(sentence)
-#st.write('score is', res)
-
-if __name__ == "__main__":
-    app.run(debug=True)
+sentence = st.text_input("Enter the sentence","this is a well formed sentence.")
+tokens_tensor = tokenizer.encode( sentence, add_special_tokens=False, return_tensors="pt")
+res = score(tokens_tensor)
+st.write('score is', res)