code: def preprocess(self, data):
      for row in data:
          item = row.get("body")
          return item
  
file_path: serve/examples/LLM/llama2/chat_app/llama_cpp_handler.py
imports: import logging
  import os
  from abc import ABC
  import torch
  from llama_cpp import Llama
  from ts.torch_handler.base_handler import BaseHandler
label_desc: Use image node_id 3 for calling the LlamaCppHandler obj's underlying member method code with example usage: obj.preprocess(data) and returns: item