code: def get_idx_path(path_prefix: str) -> str:
      """Get the path to the index file from the prefix
  
      Args:
          path_prefix (str): The prefix
  
      Returns:
          str: The path to the index file
      """
      return path_prefix + ".idx"
  
imports: import logging
  import os
  import shutil
  import struct
  import time
  from enum import Enum
  from functools import lru_cache
  from itertools import accumulate
  from types import TracebackType
  from typing import List, Optional, Tuple, Type, Union
  import numpy
  import torch
  from megatron.core.datasets.utils import log_single_rank
label_desc: Use image node_id 1 for calling a global function with example usage: get_idx_path(path_prefix) and returns: unknown