Save the following code as chatbot.py.
from transformers import AutoModelForCausalLM, AutoTokenizer
import torch
# Load pre-trained model and tokenizer
model_name = "microsoft/DialoGPT-small"
tokenizer = AutoTokenizer.from_pretrained(model_name)
model = AutoModelForCausalLM.from_pretrained(model_name)
# Initialize chat history
chat_history_ids = None
def chat_with_bot(user_input):
global chat_history_ids
# Encode the new user input, add the eos_token and return a tensor in Pytorch
new_user_input_ids = tokenizer.encode(user_input + tokenizer.eos_token, return_tensors='pt')
# Append the new user input tokens to the chat history
bot_input_ids = torch.cat([chat_history_ids, new_user_input_ids], dim=-1) if chat_history_ids is not None else new_user_input_ids
# Generate a response
chat_history_ids = model.generate(bot_input_ids, max_length=1000, pad_token_id=tokenizer.eos_token_id)
# Decode the last response
bot_response = tokenizer.decode(chat_history_ids[:, bot_input_ids.shape[-1]:][0], skip_special_tokens=True)
return bot_response
if __name__ == "__main__":
print("Start chatting with the AI chatbot (type 'exit' to stop)!")
while True:
user_input = input("You: ")
if user_input.lower() == "exit":
break
bot_response = chat_with_bot(user_input)
print(f"Bot: {bot_response}")