app.py

import gradio as gr
import torch
from transformers import (AutoModel, AutoModelForCausalLM, AutoTokenizer,
                          LlamaForCausalLM, LlamaTokenizer)

title = "🤖AI HeavyMetal-ChatBot"
description = "A State-of-the-Art Large-scale Pretrained Response generation model (DialoGPT)"
examples = [["How are you?"]]


# tokenizer = AutoTokenizer.from_pretrained("microsoft/DialoGPT-large")
# model = AutoModelForCausalLM.from_pretrained("microsoft/DialoGPT-large")
# tokenizer = LlamaTokenizer.from_pretrained("hf-internal-testing/llama-tokenizer")
# model = LlamaForCausalLM.from_pretrained("hf-internal-testing/llama-tokenizer")

model = "meta-llama/Llama-2-7b-chat-hf"

tokenizer = AutoTokenizer.from_pretrained(model)


def predict(input, history=[]):
    # tokenize the new input sentence
    new_user_input_ids = tokenizer.encode(
        input + tokenizer.eos_token, return_tensors="pt"
    )

    # append the new user input tokens to the chat history
    bot_input_ids = torch.cat([torch.LongTensor(history), new_user_input_ids], dim=-1)

    # generate a response
    history = model.generate(
        bot_input_ids, max_length=4000, pad_token_id=tokenizer.eos_token_id
    ).tolist()

    # convert the tokens to text, and then split the responses into lines
    response = tokenizer.decode(history[0]).split("<|endoftext|>")
    # print('decoded_response-->>'+str(response))
    response = [
        (response[i], response[i + 1]) for i in range(0, len(response) - 1, 2)
    ]  # convert to tuples of list
    # print('response-->>'+str(response))
    return response, history


gr.Interface(
    fn=predict,
    title=title,
    description=description,
    examples=examples,
    inputs=["text", "state"],
    outputs=["chatbot", "state"],
    # theme="finlaymacklon/boxy_violet",
    theme='HaleyCH/HaleyCH_Theme',
).launch()