web_demo.py

"""
This script refers to the dialogue example of streamlit, the interactive generation code of chatglm2 and transformers. We mainly modified part of the code logic to adapt to the generation of our model.
Please refer to these links below for more information:
    1. streamlit chat example: https://docs.streamlit.io/knowledge-base/tutorials/build-conversational-apps
    2. chatglm2: https://github.com/THUDM/ChatGLM2-6B
    3. transformers: https://github.com/huggingface/transformers
"""

import streamlit as st
import torch
import torch.nn as nn
from dataclasses import dataclass, asdict
from typing import List, Optional, Callable, Optional
import copy
import warnings
import logging
from transformers import AutoModelForCausalLM, AutoTokenizer
from transformers.utils import logging
from transformers.generation.utils import LogitsProcessorList, StoppingCriteriaList, GenerationConfig

logger = logging.get_logger(__name__)


@torch.inference_mode()
def generate_interactive(
    model, 
    tokenizer,
    prompt,
    generation_config: Optional[GenerationConfig] = None,
    logits_processor: Optional[LogitsProcessorList] = None,
    stopping_criteria: Optional[StoppingCriteriaList] = None,
    prefix_allowed_tokens_fn: Optional[Callable[[int, torch.Tensor], List[int]]] = None,
    additional_eos_token_id: Optional[int] = None,
    **kwargs,
):
    inputs = tokenizer([prompt], padding=True, return_tensors="pt")
    input_length = len(inputs["input_ids"][0])
    for k, v in inputs.items():
        inputs[k] = v.cuda()
    input_ids = inputs["input_ids"]
    batch_size, input_ids_seq_length = input_ids.shape[0], input_ids.shape[-1]
    if generation_config is None:
        generation_config = model.generation_config
    generation_config = copy.deepcopy(generation_config)
    model_kwargs = generation_config.update(**kwargs)
    bos_token_id, eos_token_id = generation_config.bos_token_id, generation_config.eos_token_id
    if isinstance(eos_token_id, int):
        eos_token_id = [eos_token_id]
    if additional_eos_token_id is not None:
        eos_token_id.append(additional_eos_token_id)
    has_default_max_length = kwargs.get("max_length") is None and generation_config.max_length is not None
    if has_default_max_length and generation_config.max_new_tokens is None:
        warnings.warn(
            f"Using `max_length`'s default ({generation_config.max_length}) to control the generation length. "
            "This behaviour is deprecated and will be removed from the config in v5 of Transformers -- we"
            " recommend using `max_new_tokens` to control the maximum length of the generation.",
            UserWarning,
        )
    elif generation_config.max_new_tokens is not None:
        generation_config.max_length = generation_config.max_new_tokens + input_ids_seq_length
        if not has_default_max_length:
            logger.warn(
                f"Both `max_new_tokens` (={generation_config.max_new_tokens}) and `max_length`(="
                f"{generation_config.max_length}) seem to have been set. `max_new_tokens` will take precedence. "
                "Please refer to the documentation for more information. "
                "(https://huggingface.co/docs/transformers/main/en/main_classes/text_generation)",
                UserWarning,
            )

    if input_ids_seq_length >= generation_config.max_length:
        input_ids_string = "input_ids"
        logger.warning(
            f"Input length of {input_ids_string} is {input_ids_seq_length}, but `max_length` is set to"
            f" {generation_config.max_length}. This can lead to unexpected behavior. You should consider"
            " increasing `max_new_tokens`."
        )

    # 2. Set generation parameters if not already defined
    logits_processor = logits_processor if logits_processor is not None else LogitsProcessorList()
    stopping_criteria = stopping_criteria if stopping_criteria is not None else StoppingCriteriaList()

    logits_processor = model._get_logits_processor(
        generation_config=generation_config,
        input_ids_seq_length=input_ids_seq_length,
        encoder_input_ids=input_ids,
        prefix_allowed_tokens_fn=prefix_allowed_tokens_fn,
        logits_processor=logits_processor,
    )

    stopping_criteria = model._get_stopping_criteria(
        generation_config=generation_config, stopping_criteria=stopping_criteria
    )
    logits_warper = model._get_logits_warper(generation_config)

    unfinished_sequences = input_ids.new(input_ids.shape[0]).fill_(1)
    scores = None
    while True:
        model_inputs = model.prepare_inputs_for_generation(input_ids, **model_kwargs)
        # forward pass to get next token
        outputs = model(
            **model_inputs,
            return_dict=True,
            output_attentions=False,
            output_hidden_states=False,
        )

        next_token_logits = outputs.logits[:, -1, :]

        # pre-process distribution
        next_token_scores = logits_processor(input_ids, next_token_logits)
        next_token_scores = logits_warper(input_ids, next_token_scores)

        # sample
        probs = nn.functional.softmax(next_token_scores, dim=-1)
        if generation_config.do_sample:
            next_tokens = torch.multinomial(probs, num_samples=1).squeeze(1)
        else:
            next_tokens = torch.argmax(probs, dim=-1)

        # update generated ids, model inputs, and length for next step
        input_ids = torch.cat([input_ids, next_tokens[:, None]], dim=-1)
        model_kwargs = model._update_model_kwargs_for_generation(
            outputs, model_kwargs, is_encoder_decoder=False
        )
        unfinished_sequences = unfinished_sequences.mul((min(next_tokens != i for i in eos_token_id)).long())
        
        output_token_ids = input_ids[0].cpu().tolist()
        output_token_ids = output_token_ids[input_length:]
        for each_eos_token_id in eos_token_id:
            if output_token_ids[-1] == each_eos_token_id:
                output_token_ids = output_token_ids[:-1]
        response = tokenizer.decode(output_token_ids)

        yield response
        # stop when each sentence is finished, or if we exceed the maximum length
        if unfinished_sequences.max() == 0 or stopping_criteria(input_ids, scores):
            break


def on_btn_click():
    del st.session_state.messages


@dataclass
class GenerationConfig:
    max_length: Optional[int] = None
    top_p: Optional[float] = None
    temperature: Optional[float] = None
    do_sample: Optional[bool] = True
    

@st.cache_resource
def load_model():
    model = AutoModelForCausalLM.from_pretrained("internlm/internlm-chat-7b", trust_remote_code=True).to(torch.bfloat16).cuda()
    tokenizer = AutoTokenizer.from_pretrained("internlm/internlm-chat-7b", trust_remote_code=True)
    return model, tokenizer


def prepare_generation_config():
    with st.sidebar:
        max_length = st.slider("Max Length", min_value=32, max_value=2048, value=2048)
        top_p = st.slider(
            'Top P', 0.0, 1.0, 0.8, step=0.01
        )
        temperature = st.slider(
            'Temperature', 0.0, 1.0, 0.7, step=0.01
        )
        st.button("Clear Chat History", on_click=on_btn_click)
    
    generation_config = GenerationConfig(
        max_length=max_length,
        top_p=top_p,
        temperature=temperature
    )
    
    return generation_config


user_prompt = "<|User|>:{user}<eoh>\n"
robot_prompt = "<|Bot|>:{robot}<eoa>\n"
cur_query_prompt = "<|User|>:{user}<eoh>\n<|Bot|>:"


def combine_history(prompt):
    messages = st.session_state.messages
    total_prompt = ""
    for message in messages:
        cur_content = message["content"]
        if message["role"] == "user":
            cur_prompt = user_prompt.replace("{user}", cur_content)
        elif message["role"] == "robot":
            cur_prompt = robot_prompt.replace("{robot}", cur_content)
        else:
            raise RuntimeError
        total_prompt += cur_prompt
    total_prompt = total_prompt + cur_query_prompt.replace("{user}", prompt)
    return total_prompt


def main():
    torch.cuda.empty_cache()
    print("load model begin.")
    model, tokenizer = load_model()
    print("load model end.")
    
    user_avator = "doc/imgs/user.png"
    robot_avator = "doc/imgs/robot.png"
    
    st.title("InternLM-Chat-7B")
    
    generation_config = prepare_generation_config()

    # Initialize chat history
    if "messages" not in st.session_state:
        st.session_state.messages = []

    # Display chat messages from history on app rerun
    for message in st.session_state.messages:
        with st.chat_message(message["role"], avatar=message.get("avatar")):
            st.markdown(message["content"])

    # Accept user input
    if prompt := st.chat_input("What is up?"):
        # Display user message in chat message container
        with st.chat_message("user", avatar=user_avator):
            st.markdown(prompt)
        real_prompt = combine_history(prompt)
        # Add user message to chat history
        st.session_state.messages.append({"role": "user", "content": prompt, "avatar": user_avator})

        print(f"cur real input:\n{real_prompt}\n")

        with st.chat_message("robot", avatar=robot_avator):
            message_placeholder = st.empty()
            for cur_response in generate_interactive(model=model, tokenizer=tokenizer, prompt=real_prompt, additional_eos_token_id=103028, **asdict(generation_config)):
                # Display robot response in chat message container
                message_placeholder.markdown(cur_response + "▌")
            message_placeholder.markdown(cur_response)
        print(f"cur total response:\n{cur_response}\n")
        # Add robot response to chat history
        st.session_state.messages.append({"role": "robot", "content": cur_response, "avatar": robot_avator})
        

if __name__ == "__main__":
    main()