code: def main(args):
      chain = prepare_chain(args)
      listen(chain)
  
file_path: BigDL/python/llm/example/CPU/LangChain/transformers_int4/voiceassistant.py
imports: from langchain import LLMChain, PromptTemplate
  from bigdl.llm.langchain.llms import TransformersLLM
  from langchain.memory import ConversationBufferWindowMemory
  from bigdl.llm.transformers import AutoModelForSpeechSeq2Seq
  from transformers import WhisperProcessor
  import speech_recognition
  import numpy
  import pyttsx3
  import argparse
  import time
label_desc: Use image node_id 3 for calling a global function with example usage: main(args) without return types