vlog4chat.py

import os
import sys
import time
import pickle
import numpy as np
from utils import logger_creator, format_time

import together
import warnings
#from together import Together
from langchain.prompts import PromptTemplate
from langchain.llms.base import LLM
from langchain.chains import ConversationalRetrievalChain
from langchain_core.output_parsers import StrOutputParser
from langchain.text_splitter import RecursiveCharacterTextSplitter
#from langchain.llms import HuggingFacePipeline
from langchain_community.llms import HuggingFacePipeline
#from langchain.embeddings import HuggingFaceEmbeddings
#from langchain_community.embeddings import HuggingFaceEmbeddings
from langchain_huggingface import HuggingFaceEmbeddings
from langchain_community.document_loaders import TextLoader
#from langchain.document_loaders import UnstructuredFileLoader
from langchain_community.document_loaders import UnstructuredFileLoader
from langchain_community.vectorstores import FAISS
from langchain.utils import get_from_dict_or_env
from langchain_core.runnables import RunnablePassthrough, RunnableParallel
from pydantic.v1 import Extra, Field, root_validator
from typing import Any, Dict, List, Mapping, Optional
from langchain.memory import ConversationBufferMemory
from langchain import LLMChain, PromptTemplate

warnings.filterwarnings("ignore", category=UserWarning)
B_INST, E_INST = "[INST]", "[/INST]"
B_SYS, E_SYS = "<<SYS>>\n", "\n<</SYS>>\n\n"

DEFAULT_SYSTEM_PROMPT = ""

instruction = """You are an AI assistant designed for answering questions about a video.
You are given a document and a question, the document records what people see and hear from this video.
Try to connet these information and provide a conversational answer.
Question: {question}
=========
{context}
=========
"""

system_prompt = """Given the following conversation and a follow up question, rephrase the follow up question to be a standalone question.
You can assume the discussion is about the video content.
Chat History:
{chat_history}
Follow Up Input: {question}
Standalone question:"""

def get_prompt(instruction, new_system_prompt=DEFAULT_SYSTEM_PROMPT ):
    SYSTEM_PROMPT = B_SYS + new_system_prompt + E_SYS
    prompt_template =  B_INST + SYSTEM_PROMPT + instruction + E_INST
    return prompt_template

template = get_prompt(instruction, system_prompt)

prompt = PromptTemplate(
    input_variables=["chat_history", "user_input"], template=template
)

class TogetherLLM(LLM):
    """Together large language models."""

    model: str = "togethercomputer/llama-2-70b-chat"
    """model endpoint to use"""

    together_api_key: str = os.environ["TOGETHER_API_KEY"]
    """Together API key"""

    temperature: float = 0.7
    """What sampling temperature to use."""

    max_tokens: int = 512
    """The maximum number of tokens to generate in the completion."""

    class Config:
        extra = Extra.forbid

    @root_validator()
    def validate_environment(cls, values: Dict) -> Dict:
        """Validate that the API key is set."""
        api_key = get_from_dict_or_env(
            values, "together_api_key", "TOGETHER_API_KEY"
        )
        values["together_api_key"] = api_key
        return values

    @property
    def _llm_type(self) -> str:
        """Return type of LLM."""
        return "together"

    def _call(
        self,
        prompt: str,
        **kwargs: Any,
    ) -> str:
        """Call to Together endpoint."""
        together.api_key = self.together_api_key
        output = together.Complete.create(prompt,
                                          model=self.model,
                                          max_tokens=self.max_tokens,
                                          temperature=self.temperature,
                                          top_p=0.7,
                                          top_k=50,
                                          repetition_penalty=1,
                                          stop=["</s>"],
                                          )
        text = output['choices'][0]['text']
        return text

class Vlogger4chat :
    def __init__(self, args):
        self.args = args
        self.alpha = args.alpha
        self.beta = args.beta
        self.data_dir = args.data_dir,
        self.tmp_dir = args.tmp_dir
        self.models_flag = False
        self.init_llm()
        self.history = []

        self.my_embedding = HuggingFaceEmbeddings(model_name='BAAI/bge-m3', model_kwargs={'device': 'cpu'} ,encode_kwargs={'normalize_embeddings': True}) 
            
    def init_llm(self):
        print('\033[1;33m' + "Initializing LLM Reasoner...".center(50, '-') + '\033[0m')
        self.llm = TogetherLLM(
            model= os.getenv("YOUR_MODEL_NAME"),
            temperature=0.1,
            max_tokens=768
        )
        print('\033[1;32m' + "LLM initialization finished!".center(50, '-') + '\033[0m')
            
    def exist_videolog(self, video_id):
        if isinstance(self.data_dir, tuple):
            self.data_dir = self.data_dir[0]  # 或者根据实际情况选择合适的索引
        if isinstance(video_id, tuple):
            video_id = video_id[0]  # 或者根据实际情况选择合适的索引
        log_path = os.path.join(self.data_dir, f"{video_id}.log")
        #print(f"log_path: {log_path}\n")

        if os.path.exists(log_path):
            #print("existing log path!!!\n")
            loader = UnstructuredFileLoader(log_path)
            raw_documents = loader.load()
            if not raw_documents:
                print("The log file is empty or could not be loaded.")
                return False # 如果 raw_documents 为空或所有内容都为空白，直接返回
            # Split text
            text_splitter = RecursiveCharacterTextSplitter(chunk_size=500, chunk_overlap=50)
            chunks = text_splitter.split_documents(raw_documents)
            self.vector_storage = FAISS.from_documents(chunks, self.my_embedding)    
            self.chain = ConversationalRetrievalChain.from_llm(self.llm, self.vector_storage.as_retriever(), return_source_documents=True)
            return True
        return False
    
    def create_videolog(self, video_id):
        video_id = os.path.basename(self.video_path).split('.')[0]
        log_path = os.path.join(self.data_dir, video_id + '.log')
        loader = UnstructuredFileLoader(log_path)
        raw_documents = loader.load()
        # Split text
        text_splitter = RecursiveCharacterTextSplitter(chunk_size=500, chunk_overlap=50)
        chunks = text_splitter.split_documents(raw_documents)
        self.vector_storage = FAISS.from_documents(chunks, self.my_embedding)
        self.chain = ConversationalRetrievalChain.from_llm(self.llm, self.vector_storage.as_retriever(), return_source_documents=True)
        
    def video2log(self, video_path): 
        self.video_path = video_path
        video_id = os.path.basename(video_path).split('.')[0]  
        
        if self.exist_videolog(video_id):
            return self.printlog(video_id)

        return self.printlog(video_id)
        
    def printlog(self, video_id):
        log_list = []
        log_path = os.path.join(self.data_dir, video_id + '.log')
        with open(log_path, 'r', encoding='utf-8') as f:
            for line in f:
                log_list.append(line.strip())
        return log_list

    def chat2video(self, question):
        print(f"Question: {question}")
        
        response = self.chain({"question": "请用中文回答："+question, "chat_history": self.history})['answer']
        self.history.append((question, response))
        return response

    def clean_history(self):
        self.history = []
        return