Please solve the problem of definition of Renpy

Question

I'm facing a problem about Renpy that it won't recognize original python definition like this

I'm sorry, but an uncaught exception occurred.

While running game code:
  File "game/script.rpy", line 44, in script
    python:
  File "game/script.rpy", line 47, in <module>
    response = generate_text(message)
NameError: name 'generate_text' is not defined

-- Full Traceback ------------------------------------------------------------

Full traceback:
  File "game/script.rpy", line 44, in script
    python:
  File "C:\Users\shion\OneDrive\desktop\renpy-8.1.3-sdk\renpy\ast.py", line 1138, in execute
    renpy.python.py_exec_bytecode(self.code.bytecode, self.hide, store=self.store)
  File "C:\Users\shion\OneDrive\desktop\renpy-8.1.3-sdk\renpy\python.py", line 1122, in py_exec_bytecode
    exec(bytecode, globals, locals)
  File "game/script.rpy", line 47, in <module>
    response = generate_text(message)
NameError: name 'generate_text' is not defined

Windows-10-10.0.22621 AMD64
Ren'Py 8.1.3.23091805
Live2D_AI 1.0
Wed Oct 25 00:44:38 2023

I tried several times to fix it but it won't work so I need help.

from transformers import AutoTokenizer, AutoModelForCausalLM
import sentencepiece

model_name = "C:/Users/shion/OneDrive/desktop/renpy-8.1.3-sdk/Live2D_AI/game/fine-tuned-model"
tokenizer = AutoTokenizer.from_pretrained(model_name, padding_side="left")
model = AutoModelForCausalLM.from_pretrained(model_name)

def generate_text(message, length=50):
    input_ids = tokenizer.encode(message, return_tensors='pt', padding=True, truncation=True)
    attention_mask = input_ids.ne(tokenizer.pad_token_id).float()
    output = model.generate(
        input_ids=input_ids,
        max_length=length + len(input_ids[0]),
        attention_mask=attention_mask,
        pad_token_id=tokenizer.eos_token_id,
        do_sample=True,
        top_k=50,
        top_p=0.95,
        temperature=1.0,
        num_return_sequences=1,
    )

    response = tokenizer.decode(output[0], skip_special_tokens=True)
    return response

define e = Character("Hiyori")

define config.gl2 = True
image hiyori = Live2D("Resources/hiyori", base=.6, loop = True, fade=True)

label start:
    $ renpy.block_rollback()

    show hiyori m01

    jump talk_keyboard
    return

label talk_keyboard:
    $ renpy.block_rollback()
    show hiyori m02
    python:
        thinking = 0
        message = renpy.input("You：")
        response = generate_text(message)
    if message.lower() == 'quit':
        e "Goodbye!"
        return
        jump checkRes

label checkRes:
    $ renpy.block_rollback()
    if(thinking == 0):
        show hiyori m03

        python:
            thinking = 0
        e "[response]"
        # jump answer
        jump talk_keyboard

    else:
        $ renpy.block_rollback()
        e "......"
        $ thinking = 1
        jump checkRes