Langchain-Chatchat/webui.py

import gradio as gr
import os
import shutil
from chains.local_doc_qa import LocalDocQA
from configs.model_config import *

# return top-k text chunk from vector store
VECTOR_SEARCH_TOP_K = 6

# LLM input history length
LLM_HISTORY_LEN = 3

def get_file_list():
    if not os.path.exists("content"):
        return []
    return [f for f in os.listdir("content")]


file_list = get_file_list()

embedding_model_dict_list = list(embedding_model_dict.keys())

llm_model_dict_list = list(llm_model_dict.keys())

local_doc_qa = LocalDocQA()


def upload_file(file):
    if not os.path.exists("content"):
        os.mkdir("content")
    filename = os.path.basename(file.name)
    shutil.move(file.name, "content/" + filename)
    # file_list首位插入新上传的文件
    file_list.insert(0, filename)
    return gr.Dropdown.update(choices=file_list, value=filename)


def get_answer(query, vs_path, history):
    if vs_path:
        resp, history = local_doc_qa.get_knowledge_based_answer(
            query=query, vs_path=vs_path, chat_history=history)
    else:
        history = history + [[None, "请先加载文件后，再进行提问。"]]
    return history, ""


def update_status(history, status):
    history = history + [[None, status]]
    print(status)
    return history


def init_model():
    try:
        local_doc_qa.init_cfg()
        return """模型已成功加载，请选择文件后点击"加载文件"按钮"""
    except:
        return """模型未成功加载，请重新选择后点击"加载模型"按钮"""


def reinit_model(llm_model, embedding_model, llm_history_len, use_ptuning_v2, top_k, history):
    try:
        local_doc_qa.init_cfg(llm_model=llm_model,
                              embedding_model=embedding_model,
                              llm_history_len=llm_history_len,
                              use_ptuning_v2=use_ptuning_v2,
                              top_k=top_k)
        model_status = """模型已成功重新加载，请选择文件后点击"加载文件"按钮"""
    except:
        model_status = """模型未成功重新加载，请重新选择后点击"加载模型"按钮"""
    return history + [[None, model_status]]



def get_vector_store(filepath, history):
    if local_doc_qa.llm and local_doc_qa.llm:
        vs_path = local_doc_qa.init_knowledge_vector_store(["content/" + filepath])
        if vs_path:
            file_status = "文件已成功加载，请开始提问"
        else:
            file_status = "文件未成功加载，请重新上传文件"
    else:
        file_status = "模型未完成加载，请先在加载模型后再导入文件"
        vs_path = None
    return vs_path, history + [[None, file_status]]


block_css = """.importantButton {
    background: linear-gradient(45deg, #7e0570,#5d1c99, #6e00ff) !important;
    border: none !important;
}

.importantButton:hover {
    background: linear-gradient(45deg, #ff00e0,#8500ff, #6e00ff) !important;
    border: none !important;
}"""

webui_title = """
# 🎉langchain-ChatGLM WebUI🎉

👍 [https://github.com/imClumsyPanda/langchain-ChatGLM](https://github.com/imClumsyPanda/langchain-ChatGLM)

"""

init_message = """欢迎使用 langchain-ChatGLM Web UI，开始提问前，请依次如下 3 个步骤：
1. 选择语言模型、Embedding 模型及相关参数，如果使用ptuning-v2方式微调过模型，将PrefixEncoder模型放在ptuning-v2文件夹里并勾选相关选项，然后点击"重新加载模型"，并等待加载完成提示
2. 上传或选择已有文件作为本地知识文档输入后点击"重新加载文档"，并等待加载完成提示
3. 输入要提交的问题后，点击回车提交 """


model_status = init_model()

with gr.Blocks(css=block_css) as demo:
    vs_path, file_status, model_status = gr.State(""), gr.State(""), gr.State(model_status)
    gr.Markdown(webui_title)
    with gr.Row():
        with gr.Column(scale=2):
            chatbot = gr.Chatbot([[None, init_message], [None, model_status.value]],
                                 elem_id="chat-box",
                                 show_label=False).style(height=750)
            query = gr.Textbox(show_label=False,
                               placeholder="请输入提问内容，按回车进行提交",
                               ).style(container=False)

        with gr.Column(scale=1):
            llm_model = gr.Radio(llm_model_dict_list,
                                 label="LLM 模型",
                                 value=LLM_MODEL,
                                 interactive=True)
            llm_history_len = gr.Slider(0,
                                        10,
                                        value=LLM_HISTORY_LEN,
                                        step=1,
                                        label="LLM history len",
                                        interactive=True)
            use_ptuning_v2 = gr.Checkbox(USE_PTUNING_V2,
                                         label="使用p-tuning-v2微调过的模型",
                                         interactive=True)
            embedding_model = gr.Radio(embedding_model_dict_list,
                                       label="Embedding 模型",
                                       value=EMBEDDING_MODEL,
                                       interactive=True)
            top_k = gr.Slider(1,
                              20,
                              value=VECTOR_SEARCH_TOP_K,
                              step=1,
                              label="向量匹配 top k",
                              interactive=True)
            load_model_button = gr.Button("重新加载模型")

            # with gr.Column():
            with gr.Tab("select"):
                selectFile = gr.Dropdown(file_list,
                                         label="content file",
                                         interactive=True,
                                         value=file_list[0] if len(file_list) > 0 else None)
            with gr.Tab("upload"):
                file = gr.File(label="content file",
                               file_types=['.txt', '.md', '.docx', '.pdf']
                               )  # .style(height=100)
            load_file_button = gr.Button("加载文件")
    load_model_button.click(reinit_model,
                            show_progress=True,
                            inputs=[llm_model, embedding_model, llm_history_len, use_ptuning_v2, top_k, chatbot],
                            outputs=chatbot
                            )
    # 将上传的文件保存到content文件夹下,并更新下拉框
    file.upload(upload_file,
                inputs=file,
                outputs=selectFile)
    load_file_button.click(get_vector_store,
                           show_progress=True,
                           inputs=[selectFile, chatbot],
                           outputs=[vs_path, chatbot],
                           )
    query.submit(get_answer,
                 [query, vs_path, chatbot],
                 [chatbot, query],
                 )

demo.queue(concurrency_count=3
           ).launch(server_name='0.0.0.0',
                    server_port=7860,
                    show_api=False,
                    share=False,
                    inbrowser=False)